21481253136 has 100 divisors (see below), whose sum is σ = 71054862912. Its totient is φ = 6137498304.

The previous prime is 21481253113. The next prime is 21481253141. The reversal of 21481253136 is 63135218412.

21481253136 is a `hidden beast` number, since 2 + 14 + 81 + 2 + 531 + 36 = 666.

It is a super-2 number, since 2×21481253136² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21481253136.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1174860 + ... + 1193003.

Almost surely, 2^21481253136 is an apocalyptic number.

It is an amenable number.

21481253136 is an abundant number, since it is smaller than the sum of its proper divisors (49573609776).

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

21481253136 is a wasteful number, since it uses less digits than its factorization.

21481253136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367890 (or 2367875 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The spelling of 21481253136 in words is "twenty-one billion, four hundred eighty-one million, two hundred fifty-three thousand, one hundred thirty-six".