13822221 has 16 divisors (see below), whose sum is σ = 21553664. Its totient is φ = 7714224.

The previous prime is 13822217. The next prime is 13822223. The reversal of 13822221 is 12222831.

It is a happy number.

13822221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13822221 - 2² = 13822217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13822223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6751 + ... + 8556.

It is an arithmetic number, because the mean of its divisors is an integer number (1347104).

Almost surely, 2^13822221 is an apocalyptic number.

It is an amenable number.

13822221 is a deficient number, since it is larger than the sum of its proper divisors (7731443).

13822221 is a wasteful number, since it uses less digits than its factorization.

13822221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15360.

The product of its digits is 384, while the sum is 21.

The square root of 13822221 is about 3717.8247672530. The cubic root of 13822221 is about 239.9897044195.

The spelling of 13822221 in words is "thirteen million, eight hundred twenty-two thousand, two hundred twenty-one".