21512530215532 has 12 divisors (see below), whose sum is σ = 37655992902136. Its totient is φ = 10753675100640.

The previous prime is 21512530215487. The next prime is 21512530215563. The reversal of 21512530215532 is 23551203521512.

It is a junction number, because it is equal to n+sod(n) for n = 21512530215491 and 21512530215500.

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, 647483094 + ... + 647516317.

Almost surely, 2^{21512530215532} is an apocalyptic number.

It is an amenable number.

21512530215532 is a deficient number, since it is larger than the sum of its proper divisors (16143462686604).

21512530215532 is a wasteful number, since it uses less digits than its factorization.

21512530215532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295003568 (or 1295003566 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 21512530215532 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty million, two hundred fifteen thousand, five hundred thirty-two".