13121331120 has 60 divisors (see below), whose sum is σ = 44065806096. Its totient is φ = 3499021440.

The previous prime is 13121331101. The next prime is 13121331149. The reversal of 13121331120 is 2113312131.

13121331120 is a `hidden beast` number, since 1 + 312 + 1 + 331 + 1 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13121331093 and 13121331102.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9111316 + ... + 9112755.

Almost surely, 2^13121331120 is an apocalyptic number.

13121331120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13121331120 is an abundant number, since it is smaller than the sum of its proper divisors (30944474976).

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

13121331120 is a wasteful number, since it uses less digits than its factorization.

13121331120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18224090 (or 18224081 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 13121331120 its reverse (2113312131), we get a palindrome (15234643251).

The spelling of 13121331120 in words is "thirteen billion, one hundred twenty-one million, three hundred thirty-one thousand, one hundred twenty".