21793384 has 16 divisors (see below), whose sum is σ = 42272100. Its totient is φ = 10520832.

The previous prime is 21793363. The next prime is 21793451. The reversal of 21793384 is 48339712.

It can be written as a sum of positive squares in 2 ways, for example, as 20160100 + 1633284 = 4490^2 + 1278^2 .

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, 46737 + ... + 47200.

Almost surely, 2^21793384 is an apocalyptic number.

It is an amenable number.

21793384 is a deficient number, since it is larger than the sum of its proper divisors (20478716).

21793384 is a wasteful number, since it uses less digits than its factorization.

21793384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93972 (or 93968 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 21793384 is about 4668.3384624511. The cubic root of 21793384 is about 279.3239814115.

The spelling of 21793384 in words is "twenty-one million, seven hundred ninety-three thousand, three hundred eighty-four".