121751531125 has 24 divisors (see below), whose sum is σ = 176753415384. Its totient is φ = 83486760000.

The previous prime is 121751531117. The next prime is 121751531129. The reversal of 121751531125 is 521135157121.

It can be written as a sum of positive squares in 4 ways, for example, as 15262872849 + 106488658276 = 123543^2 + 326326^2 .

It is not a de Polignac number, because 121751531125 - 2³ = 121751531117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121751531129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9932776 + ... + 9945025.

It is an arithmetic number, because the mean of its divisors is an integer number (7364725641).

Almost surely, 2^121751531125 is an apocalyptic number.

It is an amenable number.

121751531125 is a deficient number, since it is larger than the sum of its proper divisors (55001884259).

121751531125 is an equidigital number, since it uses as much as digits as its factorization.

121751531125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19877830 (or 19877813 counting only the distinct ones).

The product of its digits is 10500, while the sum is 34.

Adding to 121751531125 its reverse (521135157121), we get a palindrome (642886688246).

The spelling of 121751531125 in words is "one hundred twenty-one billion, seven hundred fifty-one million, five hundred thirty-one thousand, one hundred twenty-five".