21265532252 has 24 divisors (see below), whose sum is σ = 37313910816. Its totient is φ = 10604455488.

The previous prime is 21265532209. The next prime is 21265532297. The reversal of 21265532252 is 25223556212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2476238 + ... + 2484810.

It is an arithmetic number, because the mean of its divisors is an integer number (1554746284).

Almost surely, 2^21265532252 is an apocalyptic number.

It is an amenable number.

21265532252 is a deficient number, since it is larger than the sum of its proper divisors (16048378564).

21265532252 is a wasteful number, since it uses less digits than its factorization.

21265532252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10157 (or 10155 counting only the distinct ones).

The product of its digits is 72000, while the sum is 35.

The spelling of 21265532252 in words is "twenty-one billion, two hundred sixty-five million, five hundred thirty-two thousand, two hundred fifty-two".