121312111231 has 8 divisors (see below), whose sum is σ = 129385697760. Its totient is φ = 113342700288.

The previous prime is 121312111199. The next prime is 121312111289. The reversal of 121312111231 is 132111213121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121312111231 - 2⁵ = 121312111199 is a prime.

It is a super-2 number, since 2×121312111231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121312111199 and 121312111208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312111931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26041491 + ... + 26046148.

It is an arithmetic number, because the mean of its divisors is an integer number (16173212220).

Almost surely, 2^121312111231 is an apocalyptic number.

121312111231 is a deficient number, since it is larger than the sum of its proper divisors (8073586529).

121312111231 is a wasteful number, since it uses less digits than its factorization.

121312111231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52087793.

The product of its digits is 72, while the sum is 19.

Adding to 121312111231 its reverse (132111213121), we get a palindrome (253423324352).

The spelling of 121312111231 in words is "one hundred twenty-one billion, three hundred twelve million, one hundred eleven thousand, two hundred thirty-one".