21702957678 has 48 divisors (see below), whose sum is σ = 48144096000. Its totient is φ = 7062046992.

The previous prime is 21702957659. The next prime is 21702957791. The reversal of 21702957678 is 87675920712.

It is a happy number.

21702957678 is a `hidden beast` number, since 217 + 0 + 295 + 76 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1543323 + ... + 1557321.

It is an arithmetic number, because the mean of its divisors is an integer number (1003002000).

Almost surely, 2^21702957678 is an apocalyptic number.

21702957678 is an abundant number, since it is smaller than the sum of its proper divisors (26441138322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21702957678 is a wasteful number, since it uses less digits than its factorization.

21702957678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16053 (or 16050 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 21702957678 in words is "twenty-one billion, seven hundred two million, nine hundred fifty-seven thousand, six hundred seventy-eight".