21656503523352 has 32 divisors (see below), whose sum is σ = 54168616814400. Its totient is φ = 7215186773664.

The previous prime is 21656503523251. The next prime is 21656503523377. The reversal of 21656503523352 is 25332530565612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227934898 + ... + 228029889.

It is an arithmetic number, because the mean of its divisors is an integer number (1692769275450).

Almost surely, 2^{21656503523352} is an apocalyptic number.

It is an amenable number.

21656503523352 is an abundant number, since it is smaller than the sum of its proper divisors (32512113291048).

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

21656503523352 is a wasteful number, since it uses less digits than its factorization.

21656503523352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455966775 (or 455966771 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 48.

The spelling of 21656503523352 in words is "twenty-one trillion, six hundred fifty-six billion, five hundred three million, five hundred twenty-three thousand, three hundred fifty-two".