22003212221 has 2 divisors, whose sum is σ = 22003212222. Its totient is φ = 22003212220.

The previous prime is 22003212109. The next prime is 22003212229. The reversal of 22003212221 is 12221230022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15653512996 + 6349699225 = 125114^2 + 79685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22003212221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22003212221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22003212229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11001606110 + 11001606111.

It is an arithmetic number, because the mean of its divisors is an integer number (11001606111).

Almost surely, 2^22003212221 is an apocalyptic number.

It is an amenable number.

22003212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22003212221 is an equidigital number, since it uses as much as digits as its factorization.

22003212221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 22003212221 its reverse (12221230022), we get a palindrome (34224442243).

The spelling of 22003212221 in words is "twenty-two billion, three million, two hundred twelve thousand, two hundred twenty-one".