21113088 has 72 divisors (see below), whose sum is σ = 57787968. Its totient is φ = 6838272.

The previous prime is 21113087. The next prime is 21113089. The reversal of 21113088 is 88031112.

It is an interprime number because it is at equal distance from previous prime (21113087) and next prime (21113089).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21113083) 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, 28045 + ... + 28787.

Almost surely, 2^21113088 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 21113088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28893984).

21113088 is an abundant number, since it is smaller than the sum of its proper divisors (36674880).

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

21113088 is an equidigital number, since it uses as much as digits as its factorization.

21113088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799 (or 785 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 21113088 is about 4594.8980402181. The cubic root of 21113088 is about 276.3867713362.

The spelling of 21113088 in words is "twenty-one million, one hundred thirteen thousand, eighty-eight".