13123213131 has 16 divisors (see below), whose sum is σ = 20005113600. Its totient is φ = 7496040288.

The previous prime is 13123213127. The next prime is 13123213133. The reversal of 13123213131 is 13131232131.

It is a happy number.

13123213131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13123213131 - 2² = 13123213127 is a prime.

It is a super-2 number, since 2×13123213131² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 13123213098 and 13123213107.

It is not an unprimeable number, because it can be changed into a prime (13123213133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66996 + ... + 175313.

It is an arithmetic number, because the mean of its divisors is an integer number (1250319600).

Almost surely, 2^13123213131 is an apocalyptic number.

13123213131 is a deficient number, since it is larger than the sum of its proper divisors (6881900469).

13123213131 is a wasteful number, since it uses less digits than its factorization.

13123213131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244898.

The product of its digits is 324, while the sum is 21.

Adding to 13123213131 its reverse (13131232131), we get a palindrome (26254445262).

The spelling of 13123213131 in words is "thirteen billion, one hundred twenty-three million, two hundred thirteen thousand, one hundred thirty-one".