21136120 has 16 divisors (see below), whose sum is σ = 47556360. Its totient is φ = 8454432.

The previous prime is 21136069. The next prime is 21136123. The reversal of 21136120 is 2163112.

It is a junction number, because it is equal to n+sod(n) for n = 21136094 and 21136103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264162 + ... + 264241.

Almost surely, 2^21136120 is an apocalyptic number.

21136120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21136120 is an abundant number, since it is smaller than the sum of its proper divisors (26420240).

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

21136120 is a wasteful number, since it uses less digits than its factorization.

21136120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528414 (or 528410 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21136120 is about 4597.4036150854. The cubic root of 21136120 is about 276.4872370876.

Adding to 21136120 its reverse (2163112), we get a palindrome (23299232).

The spelling of 21136120 in words is "twenty-one million, one hundred thirty-six thousand, one hundred twenty".