13255021 has 4 divisors (see below), whose sum is σ = 14274652. Its totient is φ = 12235392.

The previous prime is 13255009. The next prime is 13255031. The reversal of 13255021 is 12055231.

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 5470921 + 7784100 = 2339^2 + 2790^2 .

It is not a de Polignac number, because 13255021 - 2¹¹ = 13252973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13255021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13255031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509796 + ... + 509821.

It is an arithmetic number, because the mean of its divisors is an integer number (3568663).

Almost surely, 2^13255021 is an apocalyptic number.

It is an amenable number.

13255021 is a deficient number, since it is larger than the sum of its proper divisors (1019631).

13255021 is a wasteful number, since it uses less digits than its factorization.

13255021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019630.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 13255021 is about 3640.7445667061. The cubic root of 13255021 is about 236.6610607237.

The spelling of 13255021 in words is "thirteen million, two hundred fifty-five thousand, twenty-one".