21872192 has 28 divisors (see below), whose sum is σ = 45689520. Its totient is φ = 10359936.

The previous prime is 21872171. The next prime is 21872203. The reversal of 21872192 is 29127812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7778 + ... + 10209.

Almost surely, 2^21872192 is an apocalyptic number.

It is an amenable number.

21872192 is an abundant number, since it is smaller than the sum of its proper divisors (23817328).

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

21872192 is a wasteful number, since it uses less digits than its factorization.

21872192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18018 (or 18008 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 21872192 is about 4676.7715360064. The cubic root of 21872192 is about 279.6602682328.

The spelling of 21872192 in words is "twenty-one million, eight hundred seventy-two thousand, one hundred ninety-two".