21874252 has 12 divisors (see below), whose sum is σ = 39314800. Its totient is φ = 10641456.

The previous prime is 21874241. The next prime is 21874261. The reversal of 21874252 is 25247812.

It is a happy number.

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, 73752 + ... + 74047.

Almost surely, 2^21874252 is an apocalyptic number.

It is an amenable number.

21874252 is a deficient number, since it is larger than the sum of its proper divisors (17440548).

21874252 is a wasteful number, since it uses less digits than its factorization.

21874252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147840 (or 147838 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 21874252 is about 4676.9917682203. The cubic root of 21874252 is about 279.6690477532.

The spelling of 21874252 in words is "twenty-one million, eight hundred seventy-four thousand, two hundred fifty-two".