21652504 has 8 divisors (see below), whose sum is σ = 40598460. Its totient is φ = 10826248.

The previous prime is 21652493. The next prime is 21652513. The reversal of 21652504 is 40525612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1353274 + ... + 1353289.

Almost surely, 2^21652504 is an apocalyptic number.

It is an amenable number.

21652504 is a deficient number, since it is larger than the sum of its proper divisors (18945956).

21652504 is a wasteful number, since it uses less digits than its factorization.

21652504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706569 (or 2706565 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 21652504 is about 4653.2251181304. The cubic root of 21652504 is about 278.7207974127.

The spelling of 21652504 in words is "twenty-one million, six hundred fifty-two thousand, five hundred four".