2272272221 has 2 divisors, whose sum is σ = 2272272222. Its totient is φ = 2272272220.

The previous prime is 2272272137. The next prime is 2272272229. The reversal of 2272272221 is 1222722722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2172492100 + 99780121 = 46610^2 + 9989^2 .

It is a cyclic number.

It is not a de Polignac number, because 2272272221 - 2¹⁸ = 2272010077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2272272229) 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 as a sum of consecutive naturals, namely, 1136136110 + 1136136111.

It is an arithmetic number, because the mean of its divisors is an integer number (1136136111).

Almost surely, 2^2272272221 is an apocalyptic number.

It is an amenable number.

2272272221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2272272221 is an equidigital number, since it uses as much as digits as its factorization.

2272272221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6272, while the sum is 29.

The square root of 2272272221 is about 47668.3566005794. The cubic root of 2272272221 is about 1314.6801924852.

Adding to 2272272221 its reverse (1222722722), we get a palindrome (3494994943).

The spelling of 2272272221 in words is "two billion, two hundred seventy-two million, two hundred seventy-two thousand, two hundred twenty-one".