21676324 has 12 divisors (see below), whose sum is σ = 37988748. Its totient is φ = 10822400.

The previous prime is 21676313. The next prime is 21676337. The reversal of 21676324 is 42367612.

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 21455424 = 470^2 + 4632^2 .

It is a congruent number.

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, 517 + ... + 6604.

It is an arithmetic number, because the mean of its divisors is an integer number (3165729).

Almost surely, 2^21676324 is an apocalyptic number.

It is an amenable number.

21676324 is a deficient number, since it is larger than the sum of its proper divisors (16312424).

21676324 is a wasteful number, since it uses less digits than its factorization.

21676324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7886 (or 7884 counting only the distinct ones).

The product of its digits is 12096, while the sum is 31.

The square root of 21676324 is about 4655.7839296943. The cubic root of 21676324 is about 278.8229672172.

The spelling of 21676324 in words is "twenty-one million, six hundred seventy-six thousand, three hundred twenty-four".