13122113121 has 24 divisors (see below), whose sum is σ = 20497626240. Its totient is φ = 8041342176.

The previous prime is 13122113113. The next prime is 13122113143. The reversal of 13122113121 is 12131122131.

13122113121 is a `hidden beast` number, since 131 + 221 + 1 + 312 + 1 = 666.

It is not a de Polignac number, because 13122113121 - 2³ = 13122113113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13122113094 and 13122113103.

It is not an unprimeable number, because it can be changed into a prime (13122113021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206671 + ... + 262596.

It is an arithmetic number, because the mean of its divisors is an integer number (854067760).

Almost surely, 2^13122113121 is an apocalyptic number.

It is an amenable number.

13122113121 is a deficient number, since it is larger than the sum of its proper divisors (7375513119).

13122113121 is a wasteful number, since it uses less digits than its factorization.

13122113121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469525 (or 469522 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 13122113121 its reverse (12131122131), we get a palindrome (25253235252).

The spelling of 13122113121 in words is "thirteen billion, one hundred twenty-two million, one hundred thirteen thousand, one hundred twenty-one".