121312100111031 has 16 divisors (see below), whose sum is σ = 179943234795520. Its totient is φ = 80775011156760.

The previous prime is 121312100111017. The next prime is 121312100111051. The reversal of 121312100111031 is 130111001213121.

It is not a de Polignac number, because 121312100111031 - 2¹⁵ = 121312100078263 is a prime.

It is a super-2 number, since 2×121312100111031² (a number of 29 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 = 121312100110995 and 121312100111013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121312100111051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2770040215 + ... + 2770084008.

It is an arithmetic number, because the mean of its divisors is an integer number (11246452174720).

Almost surely, 2^{121312100111031} is an apocalyptic number.

121312100111031 is a deficient number, since it is larger than the sum of its proper divisors (58631134684489).

121312100111031 is an equidigital number, since it uses as much as digits as its factorization.

121312100111031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5540125043 (or 5540125037 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 121312100111031 its reverse (130111001213121), we get a palindrome (251423101324152).

The spelling of 121312100111031 in words is "one hundred twenty-one trillion, three hundred twelve billion, one hundred million, one hundred eleven thousand, thirty-one".