21612652 has 12 divisors (see below), whose sum is σ = 39812920. Its totient is φ = 10237536.

The previous prime is 21612637. The next prime is 21612677. The reversal of 21612652 is 25621612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142113 + ... + 142264.

Almost surely, 2^21612652 is an apocalyptic number.

It is an amenable number.

21612652 is a deficient number, since it is larger than the sum of its proper divisors (18200268).

21612652 is a wasteful number, since it uses less digits than its factorization.

21612652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284400 (or 284398 counting only the distinct ones).

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

The square root of 21612652 is about 4648.9409546691. The cubic root of 21612652 is about 278.5496947572.

The spelling of 21612652 in words is "twenty-one million, six hundred twelve thousand, six hundred fifty-two".