21928360 has 32 divisors (see below), whose sum is σ = 49510440. Its totient is φ = 8740864.

The previous prime is 21928343. The next prime is 21928381. The reversal of 21928360 is 6382912.

It can be written as a sum of positive squares in 4 ways, for example, as 11930116 + 9998244 = 3454^2 + 3162^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13344 + ... + 14896.

Almost surely, 2^21928360 is an apocalyptic number.

21928360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21928360 is an abundant number, since it is smaller than the sum of its proper divisors (27582080).

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

21928360 is a wasteful number, since it uses less digits than its factorization.

21928360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1913 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 21928360 is about 4682.7726829305. The cubic root of 21928360 is about 279.8994536947.

The spelling of 21928360 in words is "twenty-one million, nine hundred twenty-eight thousand, three hundred sixty".