21652415 has 16 divisors (see below), whose sum is σ = 27751680. Its totient is φ = 16181760.

The previous prime is 21652391. The next prime is 21652427. The reversal of 21652415 is 51425612.

It is not a de Polignac number, because 21652415 - 2⁸ = 21652159 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2087 + ... + 6903.

It is an arithmetic number, because the mean of its divisors is an integer number (1734480).

Almost surely, 2^21652415 is an apocalyptic number.

21652415 is a deficient number, since it is larger than the sum of its proper divisors (6099265).

21652415 is a wasteful number, since it uses less digits than its factorization.

21652415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4882.

The product of its digits is 2400, while the sum is 26.

The square root of 21652415 is about 4653.2155548610. The cubic root of 21652415 is about 278.7204155294.

The spelling of 21652415 in words is "twenty-one million, six hundred fifty-two thousand, four hundred fifteen".