21374560 has 48 divisors (see below), whose sum is σ = 51026976. Its totient is φ = 8460288.

The previous prime is 21374543. The next prime is 21374597. The reversal of 21374560 is 6547312.

It is a congruent number.

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, 15832 + ... + 17128.

It is an arithmetic number, because the mean of its divisors is an integer number (1063062).

Almost surely, 2^21374560 is an apocalyptic number.

21374560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21374560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25513488).

21374560 is an abundant number, since it is smaller than the sum of its proper divisors (29652416).

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

21374560 is a wasteful number, since it uses less digits than its factorization.

21374560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415 (or 1407 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 21374560 is about 4623.2629170316. The cubic root of 21374560 is about 277.5230508677.

The spelling of 21374560 in words is "twenty-one million, three hundred seventy-four thousand, five hundred sixty".