21813196 has 12 divisors (see below), whose sum is σ = 38312848. Its totient is φ = 10866672.

The previous prime is 21813179. The next prime is 21813247. The reversal of 21813196 is 69131812.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8736 + ... + 10951.

Almost surely, 2^21813196 is an apocalyptic number.

It is an amenable number.

21813196 is a deficient number, since it is larger than the sum of its proper divisors (16499652).

21813196 is a wasteful number, since it uses less digits than its factorization.

21813196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19968 (or 19966 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 21813196 is about 4670.4599345247. The cubic root of 21813196 is about 279.4085986914.

The spelling of 21813196 in words is "twenty-one million, eight hundred thirteen thousand, one hundred ninety-six".