12513921 has 16 divisors (see below), whose sum is σ = 20191104. Its totient is φ = 6729984.

The previous prime is 12513901. The next prime is 12513923. The reversal of 12513921 is 12931521.

It is not a de Polignac number, because 12513921 - 2⁵ = 12513889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12513891 and 12513900.

It is not an unprimeable number, because it can be changed into a prime (12513923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17170 + ... + 17883.

It is an arithmetic number, because the mean of its divisors is an integer number (1261944).

Almost surely, 2^12513921 is an apocalyptic number.

It is an amenable number.

12513921 is a deficient number, since it is larger than the sum of its proper divisors (7677183).

12513921 is a wasteful number, since it uses less digits than its factorization.

12513921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35080.

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

The square root of 12513921 is about 3537.5020848050. The cubic root of 12513921 is about 232.1655637953.

The spelling of 12513921 in words is "twelve million, five hundred thirteen thousand, nine hundred twenty-one".