21512532244525 has 24 divisors (see below), whose sum is σ = 30986107349504. Its totient is φ = 14509623614400.

The previous prime is 21512532244429. The next prime is 21512532244543. The reversal of 21512532244525 is 52544223521512.

It is not a de Polignac number, because 21512532244525 - 2²⁵ = 21512498690093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1007602077 + ... + 1007623426.

Almost surely, 2^{21512532244525} is an apocalyptic number.

21512532244525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21512532244525 is a deficient number, since it is larger than the sum of its proper divisors (9473575104979).

21512532244525 is a wasteful number, since it uses less digits than its factorization.

21512532244525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015225581 (or 2015225576 counting only the distinct ones).

The product of its digits is 960000, while the sum is 43.

The spelling of 21512532244525 in words is "twenty-one trillion, five hundred twelve billion, five hundred thirty-two million, two hundred forty-four thousand, five hundred twenty-five".