121555511213 has 16 divisors (see below), whose sum is σ = 134173117440. Its totient is φ = 109618464000.

The previous prime is 121555511191. The next prime is 121555511323. The reversal of 121555511213 is 312115555121.

It is a cyclic number.

It is not a de Polignac number, because 121555511213 - 2⁶ = 121555511149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121555511213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555511113) 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, 1088633 + ... + 1195086.

It is an arithmetic number, because the mean of its divisors is an integer number (8385819840).

Almost surely, 2^121555511213 is an apocalyptic number.

It is an amenable number.

121555511213 is a deficient number, since it is larger than the sum of its proper divisors (12617606227).

121555511213 is a wasteful number, since it uses less digits than its factorization.

121555511213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283868.

The product of its digits is 7500, while the sum is 32.

The spelling of 121555511213 in words is "one hundred twenty-one billion, five hundred fifty-five million, five hundred eleven thousand, two hundred thirteen".