13250221 has 4 divisors (see below), whose sum is σ = 13265244. Its totient is φ = 13235200.

The previous prime is 13250213. The next prime is 13250227. The reversal of 13250221 is 12205231.

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 9696996 + 3553225 = 3114^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 13250221 - 2³ = 13250213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13250195 and 13250204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13250227) 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, 6100 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (3316311).

Almost surely, 2^13250221 is an apocalyptic number.

It is an amenable number.

13250221 is a deficient number, since it is larger than the sum of its proper divisors (15023).

13250221 is an equidigital number, since it uses as much as digits as its factorization.

13250221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15022.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 13250221 is about 3640.0853011983. The cubic root of 13250221 is about 236.6324901607.

Adding to 13250221 its reverse (12205231), we get a palindrome (25455452).

The spelling of 13250221 in words is "thirteen million, two hundred fifty thousand, two hundred twenty-one".