22212021212221 has 2 divisors, whose sum is σ = 22212021212222. Its totient is φ = 22212021212220.

The previous prime is 22212021212219. The next prime is 22212021212237. The reversal of 22212021212221 is 12221212021222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20311345389721 + 1900675822500 = 4506811^2 + 1378650^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212021212221 - 2¹ = 22212021212219 is a prime.

Together with 22212021212219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22212021212192 and 22212021212201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22212021210221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11106010606110 + 11106010606111.

It is an arithmetic number, because the mean of its divisors is an integer number (11106010606111).

Almost surely, 2^{22212021212221} is an apocalyptic number.

It is an amenable number.

22212021212221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22212021212221 is an equidigital number, since it uses as much as digits as its factorization.

22212021212221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 22212021212221 its reverse (12221212021222), we get a palindrome (34433233233443).

The spelling of 22212021212221 in words is "twenty-two trillion, two hundred twelve billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".