2204221221 has 8 divisors (see below), whose sum is σ = 3265512960. Its totient is φ = 1469480796.

The previous prime is 2204221177. The next prime is 2204221249. The reversal of 2204221221 is 1221224022.

2204221221 is a `hidden beast` number, since 2 + 20 + 422 + 1 + 221 = 666.

2204221221 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 2204221221 - 2⁶ = 2204221157 is a prime.

It is a super-2 number, since 2×2204221221² = 9717182382213461682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2204221194 and 2204221203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2204221121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40818885 + ... + 40818938.

It is an arithmetic number, because the mean of its divisors is an integer number (408189120).

Almost surely, 2^2204221221 is an apocalyptic number.

It is an amenable number.

2204221221 is a deficient number, since it is larger than the sum of its proper divisors (1061291739).

2204221221 is an equidigital number, since it uses as much as digits as its factorization.

2204221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81637832 (or 81637826 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2204221221 is about 46949.1344009663. The cubic root of 2204221221 is about 1301.4227462944.

Adding to 2204221221 its reverse (1221224022), we get a palindrome (3425445243).

The spelling of 2204221221 in words is "two billion, two hundred four million, two hundred twenty-one thousand, two hundred twenty-one".