22002002221 has 4 divisors (see below), whose sum is σ = 22362690844. Its totient is φ = 21641313600.

The previous prime is 22002002219. The next prime is 22002002227. The reversal of 22002002221 is 12220020022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2732675625 + 19269326596 = 52275^2 + 138814^2 .

It is a cyclic number.

It is not a de Polignac number, because 22002002221 - 2¹ = 22002002219 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 (22002002227) 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, 180344220 + ... + 180344341.

It is an arithmetic number, because the mean of its divisors is an integer number (5590672711).

Almost surely, 2^22002002221 is an apocalyptic number.

It is an amenable number.

22002002221 is a deficient number, since it is larger than the sum of its proper divisors (360688623).

22002002221 is an equidigital number, since it uses as much as digits as its factorization.

22002002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360688622.

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

Adding to 22002002221 its reverse (12220020022), we get a palindrome (34222022243).

The spelling of 22002002221 in words is "twenty-two billion, two million, two thousand, two hundred twenty-one".