21879796 has 24 divisors (see below), whose sum is σ = 39443040. Its totient is φ = 10615392.

The previous prime is 21879743. The next prime is 21879817. The reversal of 21879796 is 69797812.

It is a happy number.

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, 19030 + ... + 20146.

It is an arithmetic number, because the mean of its divisors is an integer number (1643460).

Almost surely, 2^21879796 is an apocalyptic number.

It is an amenable number.

21879796 is a deficient number, since it is larger than the sum of its proper divisors (17563244).

21879796 is a wasteful number, since it uses less digits than its factorization.

21879796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263 (or 1261 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 21879796 is about 4677.5844193344. The cubic root of 21879796 is about 279.6926730065.

The spelling of 21879796 in words is "twenty-one million, eight hundred seventy-nine thousand, seven hundred ninety-six".