21888560 has 40 divisors (see below), whose sum is σ = 51090480. Its totient is φ = 8721152.

The previous prime is 21888557. The next prime is 21888563. The reversal of 21888560 is 6588812.

It is an interprime number because it is at equal distance from previous prime (21888557) and next prime (21888563).

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

It is not an unprimeable number, because it can be changed into a prime (21888563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33194 + ... + 33846.

It is an arithmetic number, because the mean of its divisors is an integer number (1277262).

Almost surely, 2^21888560 is an apocalyptic number.

21888560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21888560 is an abundant number, since it is smaller than the sum of its proper divisors (29201920).

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

21888560 is a wasteful number, since it uses less digits than its factorization.

21888560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 1079 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 21888560 is about 4678.5211338627. The cubic root of 21888560 is about 279.7300118582.

The spelling of 21888560 in words is "twenty-one million, eight hundred eighty-eight thousand, five hundred sixty".