2220002221 has 6 divisors (see below), whose sum is σ = 2236107822. Its totient is φ = 2204011800.

The previous prime is 2220002207. The next prime is 2220002233. The reversal of 2220002221 is 1222000222.

It can be written as a sum of positive squares in only one way, i.e., 1197921321 + 1022080900 = 34611^2 + 31970^2 .

It is not a de Polignac number, because 2220002221 - 2²¹ = 2217905069 is a prime.

It is a super-2 number, since 2×2220002221² = 9856819722489865682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220002201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38130 + ... + 76771.

It is an arithmetic number, because the mean of its divisors is an integer number (372684637).

Almost surely, 2^2220002221 is an apocalyptic number.

It is an amenable number.

2220002221 is a deficient number, since it is larger than the sum of its proper divisors (16105601).

2220002221 is an equidigital number, since it uses as much as digits as its factorization.

2220002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115179 (or 115040 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2220002221 is about 47116.8995266030. The cubic root of 2220002221 is about 1304.5211850564.

Adding to 2220002221 its reverse (1222000222), we get a palindrome (3442002443).

The spelling of 2220002221 in words is "two billion, two hundred twenty million, two thousand, two hundred twenty-one".