21423696 has 40 divisors (see below), whose sum is σ = 63251904. Its totient is φ = 6120960.

The previous prime is 21423679. The next prime is 21423709. The reversal of 21423696 is 69632412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31545 + ... + 32216.

Almost surely, 2^21423696 is an apocalyptic number.

It is an amenable number.

21423696 is an abundant number, since it is smaller than the sum of its proper divisors (41828208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21423696 is a wasteful number, since it uses less digits than its factorization.

21423696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63779 (or 63773 counting only the distinct ones).

The product of its digits is 15552, while the sum is 33.

The square root of 21423696 is about 4628.5738624332. The cubic root of 21423696 is about 277.7355454847.

The spelling of 21423696 in words is "twenty-one million, four hundred twenty-three thousand, six hundred ninety-six".