21602532252 has 24 divisors (see below), whose sum is σ = 57606752896. Its totient is φ = 6172152048.

The previous prime is 21602532241. The next prime is 21602532319. The reversal of 21602532252 is 25223520612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128586418 + ... + 128586585.

Almost surely, 2^21602532252 is an apocalyptic number.

It is an amenable number.

21602532252 is an abundant number, since it is smaller than the sum of its proper divisors (36004220644).

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

21602532252 is a wasteful number, since it uses less digits than its factorization.

21602532252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257173017 (or 257173015 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21602532252 in words is "twenty-one billion, six hundred two million, five hundred thirty-two thousand, two hundred fifty-two".