2205722221 has 4 divisors (see below), whose sum is σ = 2205880992. Its totient is φ = 2205563452.

The previous prime is 2205722203. The next prime is 2205722231. The reversal of 2205722221 is 1222275022.

2205722221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1222275022 = 2 ⋅611137511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2205722221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2205722201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56311 + ... + 87076.

It is an arithmetic number, because the mean of its divisors is an integer number (551470248).

Almost surely, 2^2205722221 is an apocalyptic number.

It is an amenable number.

2205722221 is a deficient number, since it is larger than the sum of its proper divisors (158771).

2205722221 is a wasteful number, since it uses less digits than its factorization.

2205722221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158770.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 2205722221 is about 46965.1170657542. The cubic root of 2205722221 is about 1301.7180875369.

Adding to 2205722221 its reverse (1222275022), we get a palindrome (3427997243).

The spelling of 2205722221 in words is "two billion, two hundred five million, seven hundred twenty-two thousand, two hundred twenty-one".