21156564966702 has 32 divisors (see below), whose sum is σ = 46163063890944. Its totient is φ = 6410623934400.

The previous prime is 21156564966671. The next prime is 21156564966727. The reversal of 21156564966702 is 20766946565112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10474174 + ... + 12329697.

It is an arithmetic number, because the mean of its divisors is an integer number (1442595746592).

Almost surely, 2^{21156564966702} is an apocalyptic number.

21156564966702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21156564966702 is an abundant number, since it is smaller than the sum of its proper divisors (25006498924242).

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

21156564966702 is a wasteful number, since it uses less digits than its factorization.

21156564966702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22817944.

The product of its (nonzero) digits is 32659200, while the sum is 60.

The spelling of 21156564966702 in words is "twenty-one trillion, one hundred fifty-six billion, five hundred sixty-four million, nine hundred sixty-six thousand, seven hundred two".