21115136 has 36 divisors (see below), whose sum is σ = 48172992. Its totient is φ = 9048576.

The previous prime is 21115093. The next prime is 21115141. The reversal of 21115136 is 63151112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4100 + ... + 7683.

Almost surely, 2^21115136 is an apocalyptic number.

It is an amenable number.

21115136 is an abundant number, since it is smaller than the sum of its proper divisors (27057856).

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

21115136 is an equidigital number, since it uses as much as digits as its factorization.

21115136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11806 (or 11792 counting only the distinct ones).

The product of its digits is 180, while the sum is 20.

The square root of 21115136 is about 4595.1208906839. The cubic root of 21115136 is about 276.3957076858.

Adding to 21115136 its reverse (63151112), we get a palindrome (84266248).

The spelling of 21115136 in words is "twenty-one million, one hundred fifteen thousand, one hundred thirty-six".