121312312313 has 4 divisors (see below), whose sum is σ = 121319325348. Its totient is φ = 121305299280.

The previous prime is 121312312283. The next prime is 121312312361. The reversal of 121312312313 is 313213213121.

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 96797521129 + 24514791184 = 311123^2 + 156572^2 .

It is a cyclic number.

It is not a de Polignac number, because 121312312313 - 2¹² = 121312308217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121312312813) 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, 3480506 + ... + 3515187.

It is an arithmetic number, because the mean of its divisors is an integer number (30329831337).

Almost surely, 2^121312312313 is an apocalyptic number.

It is an amenable number.

121312312313 is a deficient number, since it is larger than the sum of its proper divisors (7013035).

121312312313 is an equidigital number, since it uses as much as digits as its factorization.

121312312313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7013034.

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

Adding to 121312312313 its reverse (313213213121), we get a palindrome (434525525434).

The spelling of 121312312313 in words is "one hundred twenty-one billion, three hundred twelve million, three hundred twelve thousand, three hundred thirteen".