21222323321 has 2 divisors, whose sum is σ = 21222323322. Its totient is φ = 21222323320.

The previous prime is 21222323293. The next prime is 21222323327. The reversal of 21222323321 is 12332322212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19848583225 + 1373740096 = 140885^2 + 37064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222323321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222323327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611161660 + 10611161661.

It is an arithmetic number, because the mean of its divisors is an integer number (10611161661).

Almost surely, 2^21222323321 is an apocalyptic number.

It is an amenable number.

21222323321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222323321 is an equidigital number, since it uses as much as digits as its factorization.

21222323321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

Adding to 21222323321 its reverse (12332322212), we get a palindrome (33554645533).

The spelling of 21222323321 in words is "twenty-one billion, two hundred twenty-two million, three hundred twenty-three thousand, three hundred twenty-one".