22222002221 has 8 divisors (see below), whose sum is σ = 22261905144. Its totient is φ = 22182128640.

The previous prime is 22222002203. The next prime is 22222002227. The reversal of 22222002221 is 12220022222.

It can be written as a sum of positive squares in 4 ways, for example, as 1379305321 + 20842696900 = 37139^2 + 144370^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22222002221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22222002221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222002227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1957241 + ... + 1968561.

It is an arithmetic number, because the mean of its divisors is an integer number (2782738143).

Almost surely, 2^22222002221 is an apocalyptic number.

It is an amenable number.

22222002221 is a deficient number, since it is larger than the sum of its proper divisors (39902923).

22222002221 is a wasteful number, since it uses less digits than its factorization.

22222002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14671.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 22222002221 its reverse (12220022222), we get a palindrome (34442024443).

The spelling of 22222002221 in words is "twenty-two billion, two hundred twenty-two million, two thousand, two hundred twenty-one".