21192204 has 48 divisors (see below), whose sum is σ = 54302976. Its totient is φ = 6379200.

The previous prime is 21192173. The next prime is 21192211. The reversal of 21192204 is 40229112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23449 + ... + 24335.

It is an arithmetic number, because the mean of its divisors is an integer number (1131312).

Almost surely, 2^21192204 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 21192204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27151488).

21192204 is an abundant number, since it is smaller than the sum of its proper divisors (33110772).

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

21192204 is a wasteful number, since it uses less digits than its factorization.

21192204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086 (or 1084 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21192204 is about 4603.4991039426. The cubic root of 21192204 is about 276.7315710374.

The spelling of 21192204 in words is "twenty-one million, one hundred ninety-two thousand, two hundred four".