21756101632 has 22 divisors (see below), whose sum is σ = 43490959118. Its totient is φ = 10878050304.

The previous prime is 21756101623. The next prime is 21756101651. The reversal of 21756101632 is 23610165712.

It can be written as a sum of positive squares in only one way, i.e., 21601944576 + 154157056 = 146976^2 + 12416^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10622073 + ... + 10624120.

Almost surely, 2^21756101632 is an apocalyptic number.

It is an amenable number.

21756101632 is a deficient number, since it is larger than the sum of its proper divisors (21734857486).

21756101632 is an equidigital number, since it uses as much as digits as its factorization.

21756101632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21246213 (or 21246195 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21756101632 in words is "twenty-one billion, seven hundred fifty-six million, one hundred one thousand, six hundred thirty-two".