13245921 has 12 divisors (see below), whose sum is σ = 20604948. Its totient is φ = 8151264.

The previous prime is 13245917. The next prime is 13245931. The reversal of 13245921 is 12954231.

13245921 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2117025 + 11128896 = 1455^2 + 3336^2 .

It is not a de Polignac number, because 13245921 - 2² = 13245917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13245901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56490 + ... + 56723.

It is an arithmetic number, because the mean of its divisors is an integer number (1717079).

Almost surely, 2^13245921 is an apocalyptic number.

It is an amenable number.

13245921 is a deficient number, since it is larger than the sum of its proper divisors (7359027).

13245921 is a wasteful number, since it uses less digits than its factorization.

13245921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113232 (or 113229 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 13245921 is about 3639.4946077718. The cubic root of 13245921 is about 236.6068898380.

The spelling of 13245921 in words is "thirteen million, two hundred forty-five thousand, nine hundred twenty-one".