121211113131 has 72 divisors (see below), whose sum is σ = 187126679376. Its totient is φ = 75581827200.

The previous prime is 121211113123. The next prime is 121211113139. The reversal of 121211113131 is 131311112121.

It is an interprime number because it is at equal distance from previous prime (121211113123) and next prime (121211113139).

It is not a de Polignac number, because 121211113131 - 2³ = 121211113123 is a prime.

It is a super-2 number, since 2×121211113131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121211113139) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 39909945 + ... + 39912981.

It is an arithmetic number, because the mean of its divisors is an integer number (2598981658).

Almost surely, 2^121211113131 is an apocalyptic number.

121211113131 is a deficient number, since it is larger than the sum of its proper divisors (65915566245).

121211113131 is a wasteful number, since it uses less digits than its factorization.

121211113131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3273 (or 3247 counting only the distinct ones).

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

Adding to 121211113131 its reverse (131311112121), we get a palindrome (252522225252).

The spelling of 121211113131 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred thirteen thousand, one hundred thirty-one".