21196992 has 56 divisors (see below), whose sum is σ = 56637936. Its totient is φ = 6995968.

The previous prime is 21196949. The next prime is 21197017. The reversal of 21196992 is 29969112.

It is a self number, because there is not a number n which added to its sum of digits gives 21196992.

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, 21208 + ... + 22184.

Almost surely, 2^21196992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21196992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28318968).

21196992 is an abundant number, since it is smaller than the sum of its proper divisors (35440944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21196992 is a wasteful number, since it uses less digits than its factorization.

21196992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105 (or 1095 counting only the distinct ones).

The product of its digits is 17496, while the sum is 39.

The square root of 21196992 is about 4604.0191137744. The cubic root of 21196992 is about 276.7524103200.

The spelling of 21196992 in words is "twenty-one million, one hundred ninety-six thousand, nine hundred ninety-two".