21523696529472 has 140 divisors (see below), whose sum is σ = 64519868066940. Its totient is φ = 7093952262144.

The previous prime is 21523696529453. The next prime is 21523696529507. The reversal of 21523696529472 is 27492569632512.

21523696529472 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 3 + 69 + 6 + 529 + 47 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7184629933056 + 14339066596416 = 2680416^2 + 3786696^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22864173 + ... + 23786924.

Almost surely, 2^{21523696529472} is an apocalyptic number.

It is an amenable number.

21523696529472 is an abundant number, since it is smaller than the sum of its proper divisors (42996171537468).

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

21523696529472 is an equidigital number, since it uses as much as digits as its factorization.

21523696529472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46651210 (or 46651191 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 63.

The spelling of 21523696529472 in words is "twenty-one trillion, five hundred twenty-three billion, six hundred ninety-six million, five hundred twenty-nine thousand, four hundred seventy-two".