21707804 has 12 divisors (see below), whose sum is σ = 39988200. Its totient is φ = 10282608.

The previous prime is 21707797. The next prime is 21707849. The reversal of 21707804 is 40870712.

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, 142739 + ... + 142890.

It is an arithmetic number, because the mean of its divisors is an integer number (3332350).

Almost surely, 2^21707804 is an apocalyptic number.

It is an amenable number.

21707804 is a deficient number, since it is larger than the sum of its proper divisors (18280396).

21707804 is a wasteful number, since it uses less digits than its factorization.

21707804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285652 (or 285650 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 21707804 is about 4659.1634442247. The cubic root of 21707804 is about 278.9578778750.

The spelling of 21707804 in words is "twenty-one million, seven hundred seven thousand, eight hundred four".