121231343111 has 4 divisors (see below), whose sum is σ = 121232319000. Its totient is φ = 121230367224.

The previous prime is 121231342997. The next prime is 121231343249. The reversal of 121231343111 is 111343132121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121231343111 - 2³⁰ = 120157601287 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 (121231345111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268796 + ... + 560993.

It is an arithmetic number, because the mean of its divisors is an integer number (30308079750).

Almost surely, 2^121231343111 is an apocalyptic number.

121231343111 is a deficient number, since it is larger than the sum of its proper divisors (975889).

121231343111 is an equidigital number, since it uses as much as digits as its factorization.

121231343111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975888.

The product of its digits is 432, while the sum is 23.

Adding to 121231343111 its reverse (111343132121), we get a palindrome (232574475232).

The spelling of 121231343111 in words is "one hundred twenty-one billion, two hundred thirty-one million, three hundred forty-three thousand, one hundred eleven".