13245821 has 4 divisors (see below), whose sum is σ = 13320000. Its totient is φ = 13171644.

The previous prime is 13245811. The next prime is 13245823. The reversal of 13245821 is 12854231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13245821 - 2¹⁰ = 13244797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13245823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36821 + ... + 37178.

It is an arithmetic number, because the mean of its divisors is an integer number (3330000).

Almost surely, 2^13245821 is an apocalyptic number.

It is an amenable number.

13245821 is a deficient number, since it is larger than the sum of its proper divisors (74179).

13245821 is an equidigital number, since it uses as much as digits as its factorization.

13245821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74178.

The product of its digits is 1920, while the sum is 26.

The square root of 13245821 is about 3639.4808695747. The cubic root of 13245821 is about 236.6062944158.

The spelling of 13245821 in words is "thirteen million, two hundred forty-five thousand, eight hundred twenty-one".