12915121 has 24 divisors (see below), whose sum is σ = 15030720. Its totient is φ = 11058432.

The previous prime is 12915107. The next prime is 12915131. The reversal of 12915121 is 12151921.

It is not a de Polignac number, because 12915121 - 2⁹ = 12914609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12915092 and 12915101.

It is not an unprimeable number, because it can be changed into a prime (12915101) 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, 192730 + ... + 192796.

It is an arithmetic number, because the mean of its divisors is an integer number (626280).

Almost surely, 2^12915121 is an apocalyptic number.

It is an amenable number.

12915121 is a deficient number, since it is larger than the sum of its proper divisors (2115599).

12915121 is a wasteful number, since it uses less digits than its factorization.

12915121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 136 counting only the distinct ones).

The product of its digits is 180, while the sum is 22.

The square root of 12915121 is about 3593.7613999819. The cubic root of 12915121 is about 234.6206101056.

The spelling of 12915121 in words is "twelve million, nine hundred fifteen thousand, one hundred twenty-one".