121310021231 has 12 divisors (see below), whose sum is σ = 142902018720. Its totient is φ = 102663812160.

The previous prime is 121310021179. The next prime is 121310021237. The reversal of 121310021231 is 132120013121.

It is not a de Polignac number, because 121310021231 - 2¹⁴ = 121310004847 is a prime.

It is a super-2 number, since 2×121310021231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121310021237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15665210 + ... + 15672951.

It is an arithmetic number, because the mean of its divisors is an integer number (11908501560).

Almost surely, 2^121310021231 is an apocalyptic number.

121310021231 is a deficient number, since it is larger than the sum of its proper divisors (21591997489).

121310021231 is an equidigital number, since it uses as much as digits as its factorization.

121310021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31338254 (or 31338247 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121310021231 its reverse (132120013121), we get a palindrome (253430034352).

The spelling of 121310021231 in words is "one hundred twenty-one billion, three hundred ten million, twenty-one thousand, two hundred thirty-one".