21379652 has 12 divisors (see below), whose sum is σ = 42759360. Its totient is φ = 9162696.

The previous prime is 21379619. The next prime is 21379663. The reversal of 21379652 is 25697312.

21379652 is an admirable number.

It is a super-2 number, since 2×21379652² = 914179039282208, which contains 22 as substring.

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, 381752 + ... + 381807.

It is an arithmetic number, because the mean of its divisors is an integer number (3563280).

Almost surely, 2^21379652 is an apocalyptic number.

It is an amenable number.

21379652 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21379652 is a wasteful number, since it uses less digits than its factorization.

21379652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763570 (or 763568 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 21379652 is about 4623.8135775569. The cubic root of 21379652 is about 277.5450869575.

The spelling of 21379652 in words is "twenty-one million, three hundred seventy-nine thousand, six hundred fifty-two".