21696412 has 6 divisors (see below), whose sum is σ = 37968728. Its totient is φ = 10848204.

The previous prime is 21696401. The next prime is 21696413. The reversal of 21696412 is 21469612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21696413) by changing a digit.

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 as a sum of consecutive naturals, namely, 2712048 + ... + 2712055.

Almost surely, 2^21696412 is an apocalyptic number.

It is an amenable number.

21696412 is a deficient number, since it is larger than the sum of its proper divisors (16272316).

21696412 is a wasteful number, since it uses less digits than its factorization.

21696412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5424107 (or 5424105 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 21696412 is about 4657.9407467249. The cubic root of 21696412 is about 278.9090713995.

The spelling of 21696412 in words is "twenty-one million, six hundred ninety-six thousand, four hundred twelve".