21118488 has 64 divisors (see below), whose sum is σ = 56401920. Its totient is φ = 6566400.

The previous prime is 21118441. The next prime is 21118501. The reversal of 21118488 is 88481112.

It is a super-2 number, since 2×21118488² = 891981070812288, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77793 + ... + 78063.

It is an arithmetic number, because the mean of its divisors is an integer number (881280).

Almost surely, 2^21118488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21118488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28200960).

21118488 is an abundant number, since it is smaller than the sum of its proper divisors (35283432).

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

21118488 is a wasteful number, since it uses less digits than its factorization.

21118488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 484 counting only the distinct ones).

The product of its digits is 4096, while the sum is 33.

The square root of 21118488 is about 4595.4856109012. The cubic root of 21118488 is about 276.4103327299.

The spelling of 21118488 in words is "twenty-one million, one hundred eighteen thousand, four hundred eighty-eight".