22222110221221 has 2 divisors, whose sum is σ = 22222110221222. Its totient is φ = 22222110221220.

The previous prime is 22222110221209. The next prime is 22222110221347. The reversal of 22222110221221 is 12212201122222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18330052012321 + 3892058208900 = 4281361^2 + 1972830^2 .

It is a cyclic number.

It is not a de Polignac number, because 22222110221221 - 2³¹ = 22219962737573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22222110221192 and 22222110221201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22222120221221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11111055110610 + 11111055110611.

It is an arithmetic number, because the mean of its divisors is an integer number (11111055110611).

Almost surely, 2^{22222110221221} is an apocalyptic number.

It is an amenable number.

22222110221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222110221221 is an equidigital number, since it uses as much as digits as its factorization.

22222110221221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 22222110221221 its reverse (12212201122222), we get a palindrome (34434311343443).

The spelling of 22222110221221 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".