123121311311 has 16 divisors (see below), whose sum is σ = 129542587200. Its totient is φ = 116861945088.

The previous prime is 123121311283. The next prime is 123121311329. The reversal of 123121311311 is 113113121321.

It is a cyclic number.

It is not a de Polignac number, because 123121311311 - 2¹⁰ = 123121310287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121311011) 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, 258785 + ... + 559653.

It is an arithmetic number, because the mean of its divisors is an integer number (8096411700).

Almost surely, 2^123121311311 is an apocalyptic number.

123121311311 is a deficient number, since it is larger than the sum of its proper divisors (6421275889).

123121311311 is a wasteful number, since it uses less digits than its factorization.

123121311311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301138.

The product of its digits is 108, while the sum is 20.

Adding to 123121311311 its reverse (113113121321), we get a palindrome (236234432632).

The spelling of 123121311311 in words is "one hundred twenty-three billion, one hundred twenty-one million, three hundred eleven thousand, three hundred eleven".