21520515025132 has 24 divisors (see below), whose sum is σ = 37800919808960. Its totient is φ = 10720284402960.

The previous prime is 21520515025091. The next prime is 21520515025133. The reversal of 21520515025132 is 23152051502512.

It is not an unprimeable number, because it can be changed into a prime (21520515025133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1345494 + ... + 6697117.

Almost surely, 2^{21520515025132} is an apocalyptic number.

It is an amenable number.

21520515025132 is a deficient number, since it is larger than the sum of its proper divisors (16280404783828).

21520515025132 is a wasteful number, since it uses less digits than its factorization.

21520515025132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8045101 (or 8045099 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 34.

Adding to 21520515025132 its reverse (23152051502512), we get a palindrome (44672566527644).

The spelling of 21520515025132 in words is "twenty-one trillion, five hundred twenty billion, five hundred fifteen million, twenty-five thousand, one hundred thirty-two".