21023292 has 12 divisors (see below), whose sum is σ = 49054376. Its totient is φ = 7007760.

The previous prime is 21023287. The next prime is 21023309. The reversal of 21023292 is 29232012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875959 + ... + 875982.

Almost surely, 2^21023292 is an apocalyptic number.

It is an amenable number.

21023292 is an abundant number, since it is smaller than the sum of its proper divisors (28031084).

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

21023292 is a wasteful number, since it uses less digits than its factorization.

21023292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751948 (or 1751946 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21023292 is about 4585.1163562117. The cubic root of 21023292 is about 275.9943813181.

The spelling of 21023292 in words is "twenty-one million, twenty-three thousand, two hundred ninety-two".