121510125 has 80 divisors (see below), whose sum is σ = 247351104. Its totient is φ = 58860000.

The previous prime is 121510121. The next prime is 121510133. The reversal of 121510125 is 521015121.

It is not a de Polignac number, because 121510125 - 2² = 121510121 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121510098 and 121510107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121510121) 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, 110830 + ... + 111920.

Almost surely, 2^121510125 is an apocalyptic number.

121510125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121510125 is an abundant number, since it is smaller than the sum of its proper divisors (125840979).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121510125 is a wasteful number, since it uses less digits than its factorization.

121510125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 121510125 is about 11023.1631122832. The cubic root of 121510125 is about 495.3028449822.

Adding to 121510125 its reverse (521015121), we get a palindrome (642525246).

The spelling of 121510125 in words is "one hundred twenty-one million, five hundred ten thousand, one hundred twenty-five".