13220121131 has 16 divisors (see below), whose sum is σ = 16242293760. Its totient is φ = 10506723840.

The previous prime is 13220121071. The next prime is 13220121137. The reversal of 13220121131 is 13112102231.

It is a cyclic number.

It is not a de Polignac number, because 13220121131 - 2¹⁰ = 13220120107 is a prime.

It is a super-2 number, since 2×13220121131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13220121137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1051190 + ... + 1063691.

It is an arithmetic number, because the mean of its divisors is an integer number (1015143360).

Almost surely, 2^13220121131 is an apocalyptic number.

13220121131 is a deficient number, since it is larger than the sum of its proper divisors (3022172629).

13220121131 is a wasteful number, since it uses less digits than its factorization.

13220121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114954.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 13220121131 its reverse (13112102231), we get a palindrome (26332223362).

The spelling of 13220121131 in words is "thirteen billion, two hundred twenty million, one hundred twenty-one thousand, one hundred thirty-one".