21375604 has 12 divisors (see below), whose sum is σ = 37757664. Its totient is φ = 10587704.

The previous prime is 21375587. The next prime is 21375611. The reversal of 21375604 is 40657312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24544 + ... + 25399.

It is an arithmetic number, because the mean of its divisors is an integer number (3146472).

Almost surely, 2^21375604 is an apocalyptic number.

It is an amenable number.

21375604 is a deficient number, since it is larger than the sum of its proper divisors (16382060).

21375604 is a wasteful number, since it uses less digits than its factorization.

21375604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50054 (or 50052 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21375604 is about 4623.3758229242. The cubic root of 21375604 is about 277.5275691572.

The spelling of 21375604 in words is "twenty-one million, three hundred seventy-five thousand, six hundred four".