21152530521344 has 36 divisors (see below), whose sum is σ = 42288303930180. Its totient is φ = 10559765544960.

The previous prime is 21152530521289. The next prime is 21152530521359. The reversal of 21152530521344 is 44312503525112.

It can be written as a sum of positive squares in 2 ways, for example, as 14755677881344 + 6396852640000 = 3841312^2 + 2529200^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21152530521298 and 21152530521307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64287599 + ... + 64615790.

Almost surely, 2^{21152530521344} is an apocalyptic number.

It is an amenable number.

21152530521344 is a deficient number, since it is larger than the sum of its proper divisors (21135773408836).

21152530521344 is an equidigital number, since it uses as much as digits as its factorization.

21152530521344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128904046 (or 128904032 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 21152530521344 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred thirty million, five hundred twenty-one thousand, three hundred forty-four".