121321313231 has 2 divisors, whose sum is σ = 121321313232. Its totient is φ = 121321313230.

The previous prime is 121321313213. The next prime is 121321313249. The reversal of 121321313231 is 132313123121.

Together with previous prime (121321313213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (121321313213) and next prime (121321313249).

It is a cyclic number.

It is not a de Polignac number, because 121321313231 - 2¹⁰ = 121321312207 is a prime.

It is a super-2 number, since 2×121321313231² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 121321313197 and 121321313206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121321313291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60660656615 + 60660656616.

It is an arithmetic number, because the mean of its divisors is an integer number (60660656616).

Almost surely, 2^121321313231 is an apocalyptic number.

121321313231 is a deficient number, since it is larger than the sum of its proper divisors (1).

121321313231 is an equidigital number, since it uses as much as digits as its factorization.

121321313231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

Adding to 121321313231 its reverse (132313123121), we get a palindrome (253634436352).

The spelling of 121321313231 in words is "one hundred twenty-one billion, three hundred twenty-one million, three hundred thirteen thousand, two hundred thirty-one".