121311302331 has 4 divisors (see below), whose sum is σ = 161748403112. Its totient is φ = 80874201552.

The previous prime is 121311302279. The next prime is 121311302381. The reversal of 121311302331 is 133203113121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121311302331 - 2⁹ = 121311301819 is a prime.

It is a super-2 number, since 2×121311302331² (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 = 121311302298 and 121311302307.

It is not an unprimeable number, because it can be changed into a prime (121311302381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20218550386 + ... + 20218550391.

It is an arithmetic number, because the mean of its divisors is an integer number (40437100778).

Almost surely, 2^121311302331 is an apocalyptic number.

121311302331 is a deficient number, since it is larger than the sum of its proper divisors (40437100781).

121311302331 is an equidigital number, since it uses as much as digits as its factorization.

121311302331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40437100780.

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

Adding to 121311302331 its reverse (133203113121), we get a palindrome (254514415452).

The spelling of 121311302331 in words is "one hundred twenty-one billion, three hundred eleven million, three hundred two thousand, three hundred thirty-one".