121231132313 has 4 divisors (see below), whose sum is σ = 121329137700. Its totient is φ = 121133126928.

The previous prime is 121231132289. The next prime is 121231132357. The reversal of 121231132313 is 313231132121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77555566144 + 43675566169 = 278488^2 + 208987^2 .

It is a cyclic number.

It is not a de Polignac number, because 121231132313 - 2²² = 121226938009 is a prime.

It is a super-2 number, since 2×121231132313² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121231132213) 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, 49000838 + ... + 49003311.

It is an arithmetic number, because the mean of its divisors is an integer number (30332284425).

Almost surely, 2^121231132313 is an apocalyptic number.

It is an amenable number.

121231132313 is a deficient number, since it is larger than the sum of its proper divisors (98005387).

121231132313 is an equidigital number, since it uses as much as digits as its factorization.

121231132313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98005386.

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

Adding to 121231132313 its reverse (313231132121), we get a palindrome (434462264434).

The spelling of 121231132313 in words is "one hundred twenty-one billion, two hundred thirty-one million, one hundred thirty-two thousand, three hundred thirteen".