21231633252 has 12 divisors (see below), whose sum is σ = 49540477616. Its totient is φ = 7077211080.

The previous prime is 21231633197. The next prime is 21231633287. The reversal of 21231633252 is 25233613212.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884651374 + ... + 884651397.

Almost surely, 2^21231633252 is an apocalyptic number.

It is an amenable number.

21231633252 is an abundant number, since it is smaller than the sum of its proper divisors (28308844364).

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

21231633252 is a wasteful number, since it uses less digits than its factorization.

21231633252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769302778 (or 1769302776 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The spelling of 21231633252 in words is "twenty-one billion, two hundred thirty-one million, six hundred thirty-three thousand, two hundred fifty-two".