21868260 has 24 divisors (see below), whose sum is σ = 61231296. Its totient is φ = 5831520.

The previous prime is 21868247. The next prime is 21868289. The reversal of 21868260 is 6286812.

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, 182176 + ... + 182295.

It is an arithmetic number, because the mean of its divisors is an integer number (2551304).

Almost surely, 2^21868260 is an apocalyptic number.

21868260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21868260 is an abundant number, since it is smaller than the sum of its proper divisors (39363036).

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

21868260 is a wasteful number, since it uses less digits than its factorization.

21868260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364483 (or 364481 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 21868260 is about 4676.3511416488. The cubic root of 21868260 is about 279.6435088994.

The spelling of 21868260 in words is "twenty-one million, eight hundred sixty-eight thousand, two hundred sixty".