21972096 has 48 divisors (see below), whose sum is σ = 63230310. Its totient is φ = 7323648.

The previous prime is 21972089. The next prime is 21972101. The reversal of 21972096 is 69027912.

It can be written as a sum of positive squares in only one way, i.e., 21902400 + 69696 = 4680^2 + 264^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21972096.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8385 + ... + 10688.

Almost surely, 2^21972096 is an apocalyptic number.

It is an amenable number.

21972096 is an abundant number, since it is smaller than the sum of its proper divisors (41258214).

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

21972096 is a wasteful number, since it uses less digits than its factorization.

21972096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19093 (or 19078 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 21972096 is about 4687.4402396191. The cubic root of 21972096 is about 280.0854161174.

The spelling of 21972096 in words is "twenty-one million, nine hundred seventy-two thousand, ninety-six".