121215123131 has 8 divisors (see below), whose sum is σ = 124008744000. Its totient is φ = 118430443008.

The previous prime is 121215123109. The next prime is 121215123151. The reversal of 121215123131 is 131321512121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121215123131 is a prime.

It is a super-2 number, since 2×121215123131² (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 = 121215123097 and 121215123106.

It is not an unprimeable number, because it can be changed into a prime (121215123101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2207756 + ... + 2261993.

It is an arithmetic number, because the mean of its divisors is an integer number (15501093000).

Almost surely, 2^121215123131 is an apocalyptic number.

121215123131 is a deficient number, since it is larger than the sum of its proper divisors (2793620869).

121215123131 is an equidigital number, since it uses as much as digits as its factorization.

121215123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4470373.

The product of its digits is 360, while the sum is 23.

Adding to 121215123131 its reverse (131321512121), we get a palindrome (252536635252).

The spelling of 121215123131 in words is "one hundred twenty-one billion, two hundred fifteen million, one hundred twenty-three thousand, one hundred thirty-one".