21086704 has 40 divisors (see below), whose sum is σ = 41983920. Its totient is φ = 10257408.

The previous prime is 21086687. The next prime is 21086743. The reversal of 21086704 is 40768012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186552 + ... + 186664.

It is an arithmetic number, because the mean of its divisors is an integer number (1049598).

Almost surely, 2^21086704 is an apocalyptic number.

It is an amenable number.

21086704 is a deficient number, since it is larger than the sum of its proper divisors (20897216).

21086704 is a wasteful number, since it uses less digits than its factorization.

21086704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 21086704 is about 4592.0261323298. The cubic root of 21086704 is about 276.2715943071.

The spelling of 21086704 in words is "twenty-one million, eighty-six thousand, seven hundred four".