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Problem 16


Problem 16


Power digit sum

215 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.

What is the sum of the digits of the number 21000?


幂的数字和

215 = 32768,而32768的各位数字之和是 3 + 2 + 7 + 6 + 8 = 26。

21000的各位数字之和是多少?