22012220921 has 2 divisors, whose sum is σ = 22012220922. Its totient is φ = 22012220920.

The previous prime is 22012220897. The next prime is 22012220983. The reversal of 22012220921 is 12902221022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19729292521 + 2282928400 = 140461^2 + 47780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22012220921 is a prime.

It is not a weakly prime, because it can be changed into another prime (22012210921) 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, 11006110460 + 11006110461.

It is an arithmetic number, because the mean of its divisors is an integer number (11006110461).

Almost surely, 2^22012220921 is an apocalyptic number.

It is an amenable number.

22012220921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22012220921 is an equidigital number, since it uses as much as digits as its factorization.

22012220921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 22012220921 its reverse (12902221022), we get a palindrome (34914441943).

The spelling of 22012220921 in words is "twenty-two billion, twelve million, two hundred twenty thousand, nine hundred twenty-one".