21322860 has 48 divisors (see below), whose sum is σ = 64298976. Its totient is φ = 5248512.

The previous prime is 21322849. The next prime is 21322871. The reversal of 21322860 is 6822312.

It is an interprime number because it is at equal distance from previous prime (21322849) and next prime (21322871).

It is a super-3 number, since 3×21322860³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21322860.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12889 + ... + 14448.

It is an arithmetic number, because the mean of its divisors is an integer number (1339562).

Almost surely, 2^21322860 is an apocalyptic number.

21322860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21322860 is an abundant number, since it is smaller than the sum of its proper divisors (42976116).

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

21322860 is a wasteful number, since it uses less digits than its factorization.

21322860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27362 (or 27360 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21322860 is about 4617.6682427390. The cubic root of 21322860 is about 277.2991160375.

The spelling of 21322860 in words is "twenty-one million, three hundred twenty-two thousand, eight hundred sixty".