121300000031 has 4 divisors (see below), whose sum is σ = 138628571472. Its totient is φ = 103971428592.

The previous prime is 121300000027. The next prime is 121300000039. The reversal of 121300000031 is 130000003121.

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

It is a cyclic number.

It is not a de Polignac number, because 121300000031 - 2² = 121300000027 is a prime.

It is a super-2 number, since 2×121300000031² (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 = 121299999958 and 121300000021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121300000039) 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, 8664285710 + ... + 8664285723.

It is an arithmetic number, because the mean of its divisors is an integer number (34657142868).

Almost surely, 2^121300000031 is an apocalyptic number.

121300000031 is a deficient number, since it is larger than the sum of its proper divisors (17328571441).

121300000031 is an equidigital number, since it uses as much as digits as its factorization.

121300000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17328571440.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 121300000031 its reverse (130000003121), we get a palindrome (251300003152).

The spelling of 121300000031 in words is "one hundred twenty-one billion, three hundred million, thirty-one", and thus it is an aban number.