21474880 has 56 divisors (see below), whose sum is σ = 58448448. Its totient is φ = 7362048.

The previous prime is 21474851. The next prime is 21474913. The reversal of 21474880 is 8847412.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×21474880² = 922340942028800, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 2554 + ... + 7033.

Almost surely, 2^21474880 is an apocalyptic number.

21474880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21474880 is an abundant number, since it is smaller than the sum of its proper divisors (36973568).

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

21474880 is an equidigital number, since it uses as much as digits as its factorization.

21474880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9611 (or 9601 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 21474880 is about 4634.0996968127. The cubic root of 21474880 is about 277.9565517041.

The spelling of 21474880 in words is "twenty-one million, four hundred seventy-four thousand, eight hundred eighty".