22204332312221 has 2 divisors, whose sum is σ = 22204332312222. Its totient is φ = 22204332312220.

The previous prime is 22204332312179. The next prime is 22204332312247. The reversal of 22204332312221 is 12221323340222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14670899328121 + 7533432984100 = 3830261^2 + 2744710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22204332312221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22204332312251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11102166156110 + 11102166156111.

It is an arithmetic number, because the mean of its divisors is an integer number (11102166156111).

Almost surely, 2^{22204332312221} is an apocalyptic number.

It is an amenable number.

22204332312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22204332312221 is an equidigital number, since it uses as much as digits as its factorization.

22204332312221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 22204332312221 its reverse (12221323340222), we get a palindrome (34425655652443).

The spelling of 22204332312221 in words is "twenty-two trillion, two hundred four billion, three hundred thirty-two million, three hundred twelve thousand, two hundred twenty-one".