13253021 has 4 divisors (see below), whose sum is σ = 13503132. Its totient is φ = 13002912.

The previous prime is 13253017. The next prime is 13253033. The reversal of 13253021 is 12035231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7425625 + 5827396 = 2725^2 + 2414^2 .

It is a cyclic number.

It is not a de Polignac number, because 13253021 - 2² = 13253017 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13253521) 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 3 ways as a sum of consecutive naturals, for example, 124976 + ... + 125081.

It is an arithmetic number, because the mean of its divisors is an integer number (3375783).

Almost surely, 2^13253021 is an apocalyptic number.

It is an amenable number.

13253021 is a deficient number, since it is larger than the sum of its proper divisors (250111).

13253021 is an equidigital number, since it uses as much as digits as its factorization.

13253021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250110.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 13253021 is about 3640.4698872536. The cubic root of 13253021 is about 236.6491571608.

Adding to 13253021 its reverse (12035231), we get a palindrome (25288252).

The spelling of 13253021 in words is "thirteen million, two hundred fifty-three thousand, twenty-one".