21237266052 has 36 divisors (see below), whose sum is σ = 53694484480. Its totient is φ = 7077586032.

The previous prime is 21237266041. The next prime is 21237266053. The reversal of 21237266052 is 25066273212.

21237266052 is a `hidden beast` number, since 2 + 1 + 23 + 7 + 26 + 605 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21237265998 and 21237266016.

It is not an unprimeable number, because it can be changed into a prime (21237266053) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 116349 + ... + 236667.

Almost surely, 2^21237266052 is an apocalyptic number.

It is an amenable number.

21237266052 is an abundant number, since it is smaller than the sum of its proper divisors (32457218428).

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

21237266052 is a wasteful number, since it uses less digits than its factorization.

21237266052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125232 (or 125227 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 21237266052 in words is "twenty-one billion, two hundred thirty-seven million, two hundred sixty-six thousand, fifty-two".