21197996 has 48 divisors (see below), whose sum is σ = 41583360. Its totient is φ = 9408960.

The previous prime is 21197989. The next prime is 21197999. The reversal of 21197996 is 69979112.

It is not an unprimeable number, because it can be changed into a prime (21197999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117026 + ... + 117206.

It is an arithmetic number, because the mean of its divisors is an integer number (866320).

Almost surely, 2^21197996 is an apocalyptic number.

It is an amenable number.

21197996 is a deficient number, since it is larger than the sum of its proper divisors (20385364).

21197996 is a wasteful number, since it uses less digits than its factorization.

21197996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 292 counting only the distinct ones).

The product of its digits is 61236, while the sum is 44.

The square root of 21197996 is about 4604.1281476518. The cubic root of 21197996 is about 276.7567797298.

The spelling of 21197996 in words is "twenty-one million, one hundred ninety-seven thousand, nine hundred ninety-six".