21928992 has 24 divisors (see below), whose sum is σ = 57563856. Its totient is φ = 7309632.

The previous prime is 21928987. The next prime is 21929003. The reversal of 21928992 is 29982912.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

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, 114118 + ... + 114309.

It is an arithmetic number, because the mean of its divisors is an integer number (2398494).

Almost surely, 2^21928992 is an apocalyptic number.

It is an amenable number.

21928992 is an abundant number, since it is smaller than the sum of its proper divisors (35634864).

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

21928992 is a wasteful number, since it uses less digits than its factorization.

21928992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228440 (or 228432 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 21928992 is about 4682.8401638322. The cubic root of 21928992 is about 279.9021426745.

The spelling of 21928992 in words is "twenty-one million, nine hundred twenty-eight thousand, nine hundred ninety-two".