121013255555 has 16 divisors (see below), whose sum is σ = 150433797888. Its totient is φ = 93354240000.

The previous prime is 121013255537. The next prime is 121013255557. The reversal of 121013255555 is 555552310121.

It is not a de Polignac number, because 121013255555 - 2⁸ = 121013255299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121013255557) 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, 1345646 + ... + 1432755.

It is an arithmetic number, because the mean of its divisors is an integer number (9402112368).

Almost surely, 2^121013255555 is an apocalyptic number.

121013255555 is a deficient number, since it is larger than the sum of its proper divisors (29420542333).

121013255555 is a wasteful number, since it uses less digits than its factorization.

121013255555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778718.

The product of its (nonzero) digits is 37500, while the sum is 35.

Adding to 121013255555 its reverse (555552310121), we get a palindrome (676565565676).

The spelling of 121013255555 in words is "one hundred twenty-one billion, thirteen million, two hundred fifty-five thousand, five hundred fifty-five".