21311292 has 24 divisors (see below), whose sum is σ = 49840000. Its totient is φ = 7087536.

The previous prime is 21311261. The next prime is 21311347. The reversal of 21311292 is 29211312.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 4209 + ... + 7767.

Almost surely, 2^21311292 is an apocalyptic number.

It is an amenable number.

21311292 is an abundant number, since it is smaller than the sum of its proper divisors (28528708).

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

21311292 is a wasteful number, since it uses less digits than its factorization.

21311292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065 (or 4063 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 21311292 is about 4616.4154925656. The cubic root of 21311292 is about 277.2489605324.

The spelling of 21311292 in words is "twenty-one million, three hundred eleven thousand, two hundred ninety-two".