21887360 has 64 divisors (see below), whose sum is σ = 57099600. Its totient is φ = 7956480.

The previous prime is 21887353. The next prime is 21887377. The reversal of 21887360 is 6378812.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 21887360.

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, 5486 + ... + 8594.

Almost surely, 2^21887360 is an apocalyptic number.

21887360 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 21887360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28549800).

21887360 is an abundant number, since it is smaller than the sum of its proper divisors (35212240).

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

21887360 is a wasteful number, since it uses less digits than its factorization.

21887360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21887360 is about 4678.3928864515. The cubic root of 21887360 is about 279.7248998705.

It can be divided in two parts, 218 and 87360, that added together give a palindrome (87578).

The spelling of 21887360 in words is "twenty-one million, eight hundred eighty-seven thousand, three hundred sixty".