21137484 has 24 divisors (see below), whose sum is σ = 49412160. Its totient is φ = 7032784.

The previous prime is 21137461. The next prime is 21137489. The reversal of 21137484 is 48473112.

It is not an unprimeable number, because it can be changed into a prime (21137489) 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, 6907 + ... + 9485.

It is an arithmetic number, because the mean of its divisors is an integer number (2058840).

Almost surely, 2^21137484 is an apocalyptic number.

It is an amenable number.

21137484 is an abundant number, since it is smaller than the sum of its proper divisors (28274676).

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

21137484 is a wasteful number, since it uses less digits than its factorization.

21137484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269 (or 3267 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 21137484 is about 4597.5519572921. The cubic root of 21137484 is about 276.4931845759.

The spelling of 21137484 in words is "twenty-one million, one hundred thirty-seven thousand, four hundred eighty-four".