21291796 has 24 divisors (see below), whose sum is σ = 38556000. Its totient is φ = 10282272.

The previous prime is 21291757. The next prime is 21291821. The reversal of 21291796 is 69719212.

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, 13455 + ... + 14953.

It is an arithmetic number, because the mean of its divisors is an integer number (1606500).

Almost surely, 2^21291796 is an apocalyptic number.

It is an amenable number.

21291796 is a deficient number, since it is larger than the sum of its proper divisors (17264204).

21291796 is a wasteful number, since it uses less digits than its factorization.

21291796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1621 counting only the distinct ones).

The product of its digits is 13608, while the sum is 37.

The square root of 21291796 is about 4614.3034143845. The cubic root of 21291796 is about 277.1643904236.

The spelling of 21291796 in words is "twenty-one million, two hundred ninety-one thousand, seven hundred ninety-six".