131213121123 has 16 divisors (see below), whose sum is σ = 199949308416. Its totient is φ = 74976862080.

The previous prime is 131213121047. The next prime is 131213121161. The reversal of 131213121123 is 321121312131.

It is not a de Polignac number, because 131213121123 - 2⁸ = 131213120867 is a prime.

It is a super-2 number, since 2×131213121123² (a number of 23 digits) contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 131213121123.

It is not an unprimeable number, because it can be changed into a prime (131213121023) 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, 1034203 + ... + 1154123.

It is an arithmetic number, because the mean of its divisors is an integer number (12496831776).

Almost surely, 2^131213121123 is an apocalyptic number.

131213121123 is a deficient number, since it is larger than the sum of its proper divisors (68736187293).

131213121123 is a wasteful number, since it uses less digits than its factorization.

131213121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172034.

The product of its digits is 216, while the sum is 21.

Adding to 131213121123 its reverse (321121312131), we get a palindrome (452334433254).

The spelling of 131213121123 in words is "one hundred thirty-one billion, two hundred thirteen million, one hundred twenty-one thousand, one hundred twenty-three".