121311513031 has 4 divisors (see below), whose sum is σ = 124270330464. Its totient is φ = 118352695600.

The previous prime is 121311513019. The next prime is 121311513061. The reversal of 121311513031 is 130315113121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130315113121 = 20089 ⋅6486889.

It is a cyclic number.

It is not a de Polignac number, because 121311513031 - 2¹⁷ = 121311381959 is a prime.

It is a super-2 number, since 2×121311513031² (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 = 121311512993 and 121311513011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121311513061) 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, 1479408655 + ... + 1479408736.

It is an arithmetic number, because the mean of its divisors is an integer number (31067582616).

Almost surely, 2^121311513031 is an apocalyptic number.

121311513031 is a deficient number, since it is larger than the sum of its proper divisors (2958817433).

121311513031 is an equidigital number, since it uses as much as digits as its factorization.

121311513031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2958817432.

The product of its (nonzero) digits is 270, while the sum is 22.

Adding to 121311513031 its reverse (130315113121), we get a palindrome (251626626152).

The spelling of 121311513031 in words is "one hundred twenty-one billion, three hundred eleven million, five hundred thirteen thousand, thirty-one".