21624052 has 12 divisors (see below), whose sum is σ = 39833920. Its totient is φ = 10242936.

The previous prime is 21624041. The next prime is 21624059. The reversal of 21624052 is 25042612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21624059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142188 + ... + 142339.

Almost surely, 2^21624052 is an apocalyptic number.

It is an amenable number.

21624052 is a deficient number, since it is larger than the sum of its proper divisors (18209868).

21624052 is a wasteful number, since it uses less digits than its factorization.

21624052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284550 (or 284548 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21624052 is about 4650.1668787260. The cubic root of 21624052 is about 278.5986615748.

Adding to 21624052 its reverse (25042612), we get a palindrome (46666664).

The spelling of 21624052 in words is "twenty-one million, six hundred twenty-four thousand, fifty-two".