121355344125 has 80 divisors (see below), whose sum is σ = 238150186560. Its totient is φ = 61316287200.

The previous prime is 121355344079. The next prime is 121355344127. The reversal of 121355344125 is 521443553121.

121355344125 is a `hidden beast` number, since 12 + 135 + 53 + 441 + 25 = 666.

It is not a de Polignac number, because 121355344125 - 2²³ = 121346955517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121355344125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121355344127) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 123039 + ... + 507788.

It is an arithmetic number, because the mean of its divisors is an integer number (2976877332).

Almost surely, 2^121355344125 is an apocalyptic number.

121355344125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121355344125 is a deficient number, since it is larger than the sum of its proper divisors (116794842435).

121355344125 is an equidigital number, since it uses as much as digits as its factorization.

121355344125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630873 (or 630854 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

Adding to 121355344125 its reverse (521443553121), we get a palindrome (642798897246).

The spelling of 121355344125 in words is "one hundred twenty-one billion, three hundred fifty-five million, three hundred forty-four thousand, one hundred twenty-five".