13125921 has 8 divisors (see below), whose sum is σ = 18530784. Its totient is φ = 8235840.

The previous prime is 13125899. The next prime is 13125923. The reversal of 13125921 is 12952131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13125921 - 2¹⁰ = 13124897 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13125891 and 13125900.

It is not an unprimeable number, because it can be changed into a prime (13125923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128635 + ... + 128736.

It is an arithmetic number, because the mean of its divisors is an integer number (2316348).

Almost surely, 2^13125921 is an apocalyptic number.

It is an amenable number.

13125921 is a deficient number, since it is larger than the sum of its proper divisors (5404863).

13125921 is a wasteful number, since it uses less digits than its factorization.

13125921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257391.

The product of its digits is 540, while the sum is 24.

The square root of 13125921 is about 3622.9712943936. The cubic root of 13125921 is about 235.8902163422.

The spelling of 13125921 in words is "thirteen million, one hundred twenty-five thousand, nine hundred twenty-one".