121935721113 has 24 divisors (see below), whose sum is σ = 182836250688. Its totient is φ = 81208784304.

The previous prime is 121935721111. The next prime is 121935721157. The reversal of 121935721113 is 311127539121.

It is not a de Polignac number, because 121935721113 - 2¹ = 121935721111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121935721111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9381 + ... + 493922.

It is an arithmetic number, because the mean of its divisors is an integer number (7618177112).

Almost surely, 2^121935721113 is an apocalyptic number.

It is an amenable number.

121935721113 is a deficient number, since it is larger than the sum of its proper divisors (60900529575).

121935721113 is an frugal number, since it uses more digits than its factorization.

121935721113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504315 (or 504303 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The spelling of 121935721113 in words is "one hundred twenty-one billion, nine hundred thirty-five million, seven hundred twenty-one thousand, one hundred thirteen".