13121201331 has 72 divisors (see below), whose sum is σ = 23170880304. Its totient is φ = 7125148800.

The previous prime is 13121201311. The next prime is 13121201339. The reversal of 13121201331 is 13310212131.

13121201331 is a `hidden beast` number, since 1 + 312 + 1 + 20 + 1 + 331 = 666.

It is not a de Polignac number, because 13121201331 - 2⁹ = 13121200819 is a prime.

It is a super-2 number, since 2×13121201331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13121201339) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 692281 + ... + 710981.

It is an arithmetic number, because the mean of its divisors is an integer number (321817782).

Almost surely, 2^13121201331 is an apocalyptic number.

13121201331 is a deficient number, since it is larger than the sum of its proper divisors (10049678973).

13121201331 is a wasteful number, since it uses less digits than its factorization.

13121201331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18801 (or 18791 counting only the distinct ones).

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

Adding to 13121201331 its reverse (13310212131), we get a palindrome (26431413462).

The spelling of 13121201331 in words is "thirteen billion, one hundred twenty-one million, two hundred one thousand, three hundred thirty-one".