22212121121 has 2 divisors, whose sum is σ = 22212121122. Its totient is φ = 22212121120.

The previous prime is 22212121117. The next prime is 22212121123. The reversal of 22212121121 is 12112121222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14874485521 + 7337635600 = 121961^2 + 85660^2 .

It is a cyclic number.

It is not a de Polignac number, because 22212121121 - 2² = 22212121117 is a prime.

Together with 22212121123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22212121121.

It is not a weakly prime, because it can be changed into another prime (22212121123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11106060560 + 11106060561.

It is an arithmetic number, because the mean of its divisors is an integer number (11106060561).

Almost surely, 2^22212121121 is an apocalyptic number.

It is an amenable number.

22212121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22212121121 is an equidigital number, since it uses as much as digits as its factorization.

22212121121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64, while the sum is 17.

Adding to 22212121121 its reverse (12112121222), we get a palindrome (34324242343).

The spelling of 22212121121 in words is "twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, one hundred twenty-one".