2220000221 has 2 divisors, whose sum is σ = 2220000222. Its totient is φ = 2220000220.

The previous prime is 2220000217. The next prime is 2220000229. The reversal of 2220000221 is 1220000222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1790474596 + 429525625 = 42314^2 + 20725^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220000221 - 2² = 2220000217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2220000229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110000110 + 1110000111.

It is an arithmetic number, because the mean of its divisors is an integer number (1110000111).

Almost surely, 2^2220000221 is an apocalyptic number.

It is an amenable number.

2220000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220000221 is an equidigital number, since it uses as much as digits as its factorization.

2220000221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 2220000221 is about 47116.8783027908. The cubic root of 2220000221 is about 1304.5207933086.

Adding to 2220000221 its reverse (1220000222), we get a palindrome (3440000443).

Subtracting from 2220000221 its reverse (1220000222), we obtain a palindrome (999999999).

The spelling of 2220000221 in words is "two billion, two hundred twenty million, two hundred twenty-one", and thus it is an aban number.