21690796 has 6 divisors (see below), whose sum is σ = 37958900. Its totient is φ = 10845396.

The previous prime is 21690787. The next prime is 21690803. The reversal of 21690796 is 69709612.

It is a super-2 number, since 2×21690796² = 940981262227232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2711346 + ... + 2711353.

Almost surely, 2^21690796 is an apocalyptic number.

It is an amenable number.

21690796 is a deficient number, since it is larger than the sum of its proper divisors (16268104).

21690796 is a wasteful number, since it uses less digits than its factorization.

21690796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5422703 (or 5422701 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 21690796 is about 4657.3378662064. The cubic root of 21690796 is about 278.8850046166.

The spelling of 21690796 in words is "twenty-one million, six hundred ninety thousand, seven hundred ninety-six".