121156420505 has 16 divisors (see below), whose sum is σ = 153971673984. Its totient is φ = 91204842240.

The previous prime is 121156420477. The next prime is 121156420529. The reversal of 121156420505 is 505024651121.

It is not a de Polignac number, because 121156420505 - 2²⁶ = 121089311641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 274604 + ... + 563666.

It is an arithmetic number, because the mean of its divisors is an integer number (9623229624).

Almost surely, 2^121156420505 is an apocalyptic number.

It is an amenable number.

121156420505 is a deficient number, since it is larger than the sum of its proper divisors (32815253479).

121156420505 is a wasteful number, since it uses less digits than its factorization.

121156420505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294016.

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 121156420505 in words is "one hundred twenty-one billion, one hundred fifty-six million, four hundred twenty thousand, five hundred five".