121211313131 has 16 divisors (see below), whose sum is σ = 133272705888. Its totient is φ = 109774080000.

The previous prime is 121211313109. The next prime is 121211313149. The reversal of 121211313131 is 131313112121.

It is a cyclic number.

It is not a de Polignac number, because 121211313131 - 2³⁴ = 104031443947 is a prime.

It is a super-2 number, since 2×121211313131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121211313631) 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, 1140245 + ... + 1242006.

It is an arithmetic number, because the mean of its divisors is an integer number (8329544118).

Almost surely, 2^121211313131 is an apocalyptic number.

121211313131 is a deficient number, since it is larger than the sum of its proper divisors (12061392757).

121211313131 is a wasteful number, since it uses less digits than its factorization.

121211313131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382382.

The product of its digits is 108, while the sum is 20.

Adding to 121211313131 its reverse (131313112121), we get a palindrome (252524425252).

The spelling of 121211313131 in words is "one hundred twenty-one billion, two hundred eleven million, three hundred thirteen thousand, one hundred thirty-one".