21923196 has 12 divisors (see below), whose sum is σ = 51154152. Its totient is φ = 7307728.

The previous prime is 21923179. The next prime is 21923227. The reversal of 21923196 is 69132912.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 913455 + ... + 913478.

It is an arithmetic number, because the mean of its divisors is an integer number (4262846).

Almost surely, 2^21923196 is an apocalyptic number.

It is an amenable number.

21923196 is an abundant number, since it is smaller than the sum of its proper divisors (29230956).

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

21923196 is a wasteful number, since it uses less digits than its factorization.

21923196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826940 (or 1826938 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 21923196 is about 4682.2212677318. The cubic root of 21923196 is about 279.8774804105.

The spelling of 21923196 in words is "twenty-one million, nine hundred twenty-three thousand, one hundred ninety-six".