21124136 has 16 divisors (see below), whose sum is σ = 43208640. Its totient is φ = 9601840.

The previous prime is 21124123. The next prime is 21124141. The reversal of 21124136 is 63142112.

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, 119936 + ... + 120111.

It is an arithmetic number, because the mean of its divisors is an integer number (2700540).

Almost surely, 2^21124136 is an apocalyptic number.

It is an amenable number.

21124136 is an abundant number, since it is smaller than the sum of its proper divisors (22084504).

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

21124136 is a wasteful number, since it uses less digits than its factorization.

21124136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240064 (or 240060 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 21124136 is about 4596.1000859424. The cubic root of 21124136 is about 276.4349719056.

Adding to 21124136 its reverse (63142112), we get a palindrome (84266248).

The spelling of 21124136 in words is "twenty-one million, one hundred twenty-four thousand, one hundred thirty-six".