21672296 has 32 divisors (see below), whose sum is σ = 41610240. Its totient is φ = 10579968.

The previous prime is 21672271. The next prime is 21672319. The reversal of 21672296 is 69227612.

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, 84200 + ... + 84456.

It is an arithmetic number, because the mean of its divisors is an integer number (1300320).

Almost surely, 2^21672296 is an apocalyptic number.

It is an amenable number.

21672296 is a deficient number, since it is larger than the sum of its proper divisors (19937944).

21672296 is a wasteful number, since it uses less digits than its factorization.

21672296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 469 counting only the distinct ones).

The product of its digits is 18144, while the sum is 35.

The square root of 21672296 is about 4655.3513293843. The cubic root of 21672296 is about 278.8056954005.

The spelling of 21672296 in words is "twenty-one million, six hundred seventy-two thousand, two hundred ninety-six".