13826221 has 2 divisors, whose sum is σ = 13826222. Its totient is φ = 13826220.

The previous prime is 13826213. The next prime is 13826233. The reversal of 13826221 is 12262831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11485321 + 2340900 = 3389^2 + 1530^2 .

It is a cyclic number.

It is not a de Polignac number, because 13826221 - 2³ = 13826213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13826251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6913110 + 6913111.

It is an arithmetic number, because the mean of its divisors is an integer number (6913111).

Almost surely, 2^13826221 is an apocalyptic number.

It is an amenable number.

13826221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13826221 is an equidigital number, since it uses as much as digits as its factorization.

13826221 is an evil number, because the sum of its binary digits is even.

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

The square root of 13826221 is about 3718.3626773084. The cubic root of 13826221 is about 240.0128523210.

The spelling of 13826221 in words is "thirteen million, eight hundred twenty-six thousand, two hundred twenty-one".