2207645221 has 2 divisors, whose sum is σ = 2207645222. Its totient is φ = 2207645220.

The previous prime is 2207645203. The next prime is 2207645227. The reversal of 2207645221 is 1225467022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1255922721 + 951722500 = 35439^2 + 30850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2207645221 - 2¹¹ = 2207643173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2207645227) 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, 1103822610 + 1103822611.

It is an arithmetic number, because the mean of its divisors is an integer number (1103822611).

Almost surely, 2^2207645221 is an apocalyptic number.

It is an amenable number.

2207645221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2207645221 is an equidigital number, since it uses as much as digits as its factorization.

2207645221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 2207645221 is about 46985.5852469670. The cubic root of 2207645221 is about 1302.0962670375.

The spelling of 2207645221 in words is "two billion, two hundred seven million, six hundred forty-five thousand, two hundred twenty-one".