121513505125 has 16 divisors (see below), whose sum is σ = 158242286592. Its totient is φ = 92984245200.

The previous prime is 121513505117. The next prime is 121513505129. The reversal of 121513505125 is 521505315121.

It is not a de Polignac number, because 121513505125 - 2³ = 121513505117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121513505129) 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, 21129909 + ... + 21135658.

It is an arithmetic number, because the mean of its divisors is an integer number (9890142912).

Almost surely, 2^121513505125 is an apocalyptic number.

It is an amenable number.

121513505125 is a deficient number, since it is larger than the sum of its proper divisors (36728781467).

121513505125 is an equidigital number, since it uses as much as digits as its factorization.

121513505125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42265605 (or 42265595 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 121513505125 in words is "one hundred twenty-one billion, five hundred thirteen million, five hundred five thousand, one hundred twenty-five".