13622221 has 4 divisors (see below), whose sum is σ = 14339200. Its totient is φ = 12905244.

The previous prime is 13622177. The next prime is 13622269. The reversal of 13622221 is 12222631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12222631 = 61 ⋅200371.

It is a cyclic number.

It is not a de Polignac number, because 13622221 - 2¹⁵ = 13589453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 716959 = 13622221 / (1 + 3 + 6 + 2 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13628221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358461 + ... + 358498.

It is an arithmetic number, because the mean of its divisors is an integer number (3584800).

Almost surely, 2^13622221 is an apocalyptic number.

It is an amenable number.

13622221 is a deficient number, since it is larger than the sum of its proper divisors (716979).

13622221 is an equidigital number, since it uses as much as digits as its factorization.

13622221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716978.

The product of its digits is 288, while the sum is 19.

The square root of 13622221 is about 3690.8293106022. The cubic root of 13622221 is about 238.8265695582.

Adding to 13622221 its reverse (12222631), we get a palindrome (25844852).

The spelling of 13622221 in words is "thirteen million, six hundred twenty-two thousand, two hundred twenty-one".