21039692 has 6 divisors (see below), whose sum is σ = 36819468. Its totient is φ = 10519844.

The previous prime is 21039677. The next prime is 21039701. The reversal of 21039692 is 29693012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629958 + ... + 2629965.

It is an arithmetic number, because the mean of its divisors is an integer number (6136578).

Almost surely, 2^21039692 is an apocalyptic number.

It is an amenable number.

21039692 is a deficient number, since it is larger than the sum of its proper divisors (15779776).

21039692 is a wasteful number, since it uses less digits than its factorization.

21039692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5259927 (or 5259925 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 21039692 is about 4586.9044027536. The cubic root of 21039692 is about 276.0661292218.

The spelling of 21039692 in words is "twenty-one million, thirty-nine thousand, six hundred ninety-two".