13286221 has 4 divisors (see below), whose sum is σ = 14308252. Its totient is φ = 12264192.

The previous prime is 13286191. The next prime is 13286233. The reversal of 13286221 is 12268231.

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 1929321 + 11356900 = 1389^2 + 3370^2 .

It is a cyclic number.

It is not a de Polignac number, because 13286221 - 2⁹ = 13285709 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 (13286261) 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, 510996 + ... + 511021.

It is an arithmetic number, because the mean of its divisors is an integer number (3577063).

Almost surely, 2^13286221 is an apocalyptic number.

It is an amenable number.

13286221 is a deficient number, since it is larger than the sum of its proper divisors (1022031).

13286221 is a wasteful number, since it uses less digits than its factorization.

13286221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022030.

The product of its digits is 1152, while the sum is 25.

The square root of 13286221 is about 3645.0268860462. The cubic root of 13286221 is about 236.8466014646.

The spelling of 13286221 in words is "thirteen million, two hundred eighty-six thousand, two hundred twenty-one".