121131221013 has 56 divisors (see below), whose sum is σ = 198992279520. Its totient is φ = 73091172960.

The previous prime is 121131220967. The next prime is 121131221017. The reversal of 121131221013 is 310122131121.

It is not a de Polignac number, because 121131221013 - 2¹⁴ = 121131204629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131221017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1803370 + ... + 1869332.

Almost surely, 2^121131221013 is an apocalyptic number.

It is an amenable number.

121131221013 is a deficient number, since it is larger than the sum of its proper divisors (77861058507).

121131221013 is an equidigital number, since it uses as much as digits as its factorization.

121131221013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66221 (or 66206 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 121131221013 its reverse (310122131121), we get a palindrome (431253352134).

The spelling of 121131221013 in words is "one hundred twenty-one billion, one hundred thirty-one million, two hundred twenty-one thousand, thirteen".