21292252 has 6 divisors (see below), whose sum is σ = 37261448. Its totient is φ = 10646124.

The previous prime is 21292241. The next prime is 21292253. The reversal of 21292252 is 25229212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21292253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2661528 + ... + 2661535.

Almost surely, 2^21292252 is an apocalyptic number.

It is an amenable number.

21292252 is a deficient number, since it is larger than the sum of its proper divisors (15969196).

21292252 is a wasteful number, since it uses less digits than its factorization.

21292252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323067 (or 5323065 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 21292252 is about 4614.3528256951. The cubic root of 21292252 is about 277.1663690583.

The spelling of 21292252 in words is "twenty-one million, two hundred ninety-two thousand, two hundred fifty-two".