21620756942792 has 36 divisors (see below), whose sum is σ = 47157719130315. Its totient is φ = 9265999234800.

The previous prime is 21620756942789. The next prime is 21620756942833. The reversal of 21620756942792 is 29724965702612.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 10810378471396 + 10810378471396 = 3287914^2 + 3287914^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3287914.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 91944167 + ... + 92179017.

Almost surely, 2^{21620756942792} is an apocalyptic number.

It is an amenable number.

21620756942792 is an abundant number, since it is smaller than the sum of its proper divisors (25536962187523).

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

21620756942792 is an frugal number, since it uses more digits than its factorization.

21620756942792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469722 (or 234860 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 62.

The spelling of 21620756942792 in words is "twenty-one trillion, six hundred twenty billion, seven hundred fifty-six million, nine hundred forty-two thousand, seven hundred ninety-two".