13396221 has 12 divisors (see below), whose sum is σ = 20488572. Its totient is φ = 8405376.

The previous prime is 13396213. The next prime is 13396223. The reversal of 13396221 is 12269331.

13396221 is a `hidden beast` number, since 1 + 3 + 39 + 622 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4575321 + 8820900 = 2139^2 + 2970^2 .

It is not a de Polignac number, because 13396221 - 2³ = 13396213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13396223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43626 + ... + 43931.

It is an arithmetic number, because the mean of its divisors is an integer number (1707381).

Almost surely, 2^13396221 is an apocalyptic number.

It is an amenable number.

13396221 is a deficient number, since it is larger than the sum of its proper divisors (7092351).

13396221 is a wasteful number, since it uses less digits than its factorization.

13396221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87580 (or 87577 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 13396221 is about 3660.0848350824. The cubic root of 13396221 is about 237.4984435724.

The spelling of 13396221 in words is "thirteen million, three hundred ninety-six thousand, two hundred twenty-one".