21365522471632 has 10 divisors (see below), whose sum is σ = 41395699788818. Its totient is φ = 10682761235808.

The previous prime is 21365522471599. The next prime is 21365522471707. The reversal of 21365522471632 is 23617422556312.

It can be written as a sum of positive squares in only one way, i.e., 14078524562496 + 7286997909136 = 3752136^2 + 2699444^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 667672577223 + ... + 667672577254.

Almost surely, 2^{21365522471632} is an apocalyptic number.

It is an amenable number.

21365522471632 is a deficient number, since it is larger than the sum of its proper divisors (20030177317186).

21365522471632 is a wasteful number, since it uses less digits than its factorization.

21365522471632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335345154485 (or 1335345154479 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 49.

The spelling of 21365522471632 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred twenty-two million, four hundred seventy-one thousand, six hundred thirty-two".