21875804 has 24 divisors (see below), whose sum is σ = 40687920. Its totient is φ = 10255616.

The previous prime is 21875797. The next prime is 21875827. The reversal of 21875804 is 40857812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26039 + ... + 26865.

It is an arithmetic number, because the mean of its divisors is an integer number (1695330).

Almost surely, 2^21875804 is an apocalyptic number.

It is an amenable number.

21875804 is a deficient number, since it is larger than the sum of its proper divisors (18812116).

21875804 is a wasteful number, since it uses less digits than its factorization.

21875804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237 (or 1235 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 21875804 is about 4677.1576838931. The cubic root of 21875804 is about 279.6756618628.

The spelling of 21875804 in words is "twenty-one million, eight hundred seventy-five thousand, eight hundred four".