21422980 has 12 divisors (see below), whose sum is σ = 44988300. Its totient is φ = 8569184.

The previous prime is 21422939. The next prime is 21422993. The reversal of 21422980 is 8922412.

It can be written as a sum of positive squares in 2 ways, for example, as 7043716 + 14379264 = 2654^2 + 3792^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535555 + ... + 535594.

It is an arithmetic number, because the mean of its divisors is an integer number (3749025).

Almost surely, 2^21422980 is an apocalyptic number.

21422980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21422980 is an abundant number, since it is smaller than the sum of its proper divisors (23565320).

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

21422980 is a wasteful number, since it uses less digits than its factorization.

21422980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071158 (or 1071156 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21422980 is about 4628.4965161486. The cubic root of 21422980 is about 277.7324513895.

The spelling of 21422980 in words is "twenty-one million, four hundred twenty-two thousand, nine hundred eighty".