121751431125 has 16 divisors (see below), whose sum is σ = 202594382016. Its totient is φ = 64934096400.

The previous prime is 121751431117. The next prime is 121751431157. The reversal of 121751431125 is 521134157121.

It is not a de Polignac number, because 121751431125 - 2³ = 121751431117 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, 162334867 + ... + 162335616.

It is an arithmetic number, because the mean of its divisors is an integer number (12662148876).

Almost surely, 2^121751431125 is an apocalyptic number.

121751431125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121751431125 is a deficient number, since it is larger than the sum of its proper divisors (80842950891).

121751431125 is an equidigital number, since it uses as much as digits as its factorization.

121751431125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324670501 (or 324670491 counting only the distinct ones).

The product of its digits is 8400, while the sum is 33.

Adding to 121751431125 its reverse (521134157121), we get a palindrome (642885588246).

The spelling of 121751431125 in words is "one hundred twenty-one billion, seven hundred fifty-one million, four hundred thirty-one thousand, one hundred twenty-five".