121255113255 has 16 divisors (see below), whose sum is σ = 194514739200. Its totient is φ = 64500541088.

The previous prime is 121255113241. The next prime is 121255113271. The reversal of 121255113255 is 552311552121.

It is a cyclic number.

It is not a de Polignac number, because 121255113255 - 2⁷ = 121255113127 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10547355 + ... + 10558844.

It is an arithmetic number, because the mean of its divisors is an integer number (12157171200).

Almost surely, 2^121255113255 is an apocalyptic number.

121255113255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121255113255 is a deficient number, since it is larger than the sum of its proper divisors (73259625945).

121255113255 is a wasteful number, since it uses less digits than its factorization.

121255113255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21106590.

The product of its digits is 15000, while the sum is 33.

Adding to 121255113255 its reverse (552311552121), we get a palindrome (673566665376).

The spelling of 121255113255 in words is "one hundred twenty-one billion, two hundred fifty-five million, one hundred thirteen thousand, two hundred fifty-five".