21092480 has 32 divisors (see below), whose sum is σ = 50425740. Its totient is φ = 8436736.

The previous prime is 21092459. The next prime is 21092501. The reversal of 21092480 is 8429012.

It is an interprime number because it is at equal distance from previous prime (21092459) and next prime (21092501).

It can be written as a sum of positive squares in 2 ways, for example, as 19855936 + 1236544 = 4456^2 + 1112^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 15839 + ... + 17118.

Almost surely, 2^21092480 is an apocalyptic number.

21092480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21092480 is an abundant number, since it is smaller than the sum of its proper divisors (29333260).

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

21092480 is an equidigital number, since it uses as much as digits as its factorization.

21092480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32976 (or 32964 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21092480 is about 4592.6550055496. The cubic root of 21092480 is about 276.2968171371.

The spelling of 21092480 in words is "twenty-one million, ninety-two thousand, four hundred eighty".