21484560 has 40 divisors (see below), whose sum is σ = 66602880. Its totient is φ = 5729152.

The previous prime is 21484543. The next prime is 21484571. The reversal of 21484560 is 6548412.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 44520 + ... + 44999.

It is an arithmetic number, because the mean of its divisors is an integer number (1665072).

Almost surely, 2^21484560 is an apocalyptic number.

21484560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21484560 is an abundant number, since it is smaller than the sum of its proper divisors (45118320).

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

21484560 is a wasteful number, since it uses less digits than its factorization.

21484560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89535 (or 89529 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 21484560 is about 4635.1440107078. The cubic root of 21484560 is about 277.9983092560.

The spelling of 21484560 in words is "twenty-one million, four hundred eighty-four thousand, five hundred sixty".