21375364 has 6 divisors (see below), whose sum is σ = 37406894. Its totient is φ = 10687680.

The previous prime is 21375359. The next prime is 21375371. The reversal of 21375364 is 46357312.

It can be written as a sum of positive squares in only one way, i.e., 17572864 + 3802500 = 4192^2 + 1950^2 .

It is a super-2 number, since 2×21375364² = 913812372264992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2671917 + ... + 2671924.

Almost surely, 2^21375364 is an apocalyptic number.

It is an amenable number.

21375364 is a deficient number, since it is larger than the sum of its proper divisors (16031530).

21375364 is a wasteful number, since it uses less digits than its factorization.

21375364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5343845 (or 5343843 counting only the distinct ones).

The product of its digits is 15120, while the sum is 31.

The square root of 21375364 is about 4623.3498677907. The cubic root of 21375364 is about 277.5265304830.

The spelling of 21375364 in words is "twenty-one million, three hundred seventy-five thousand, three hundred sixty-four".