22222121121121 has 2 divisors, whose sum is σ = 22222121121122. Its totient is φ = 22222121121120.

The previous prime is 22222121121119. The next prime is 22222121121149. The reversal of 22222121121121 is 12112112122222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21708657155025 + 513463966096 = 4659255^2 + 716564^2 .

It is a cyclic number.

It is not a de Polignac number, because 22222121121121 - 2¹ = 22222121121119 is a prime.

Together with 22222121121119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22222121121092 and 22222121121101.

It is not a weakly prime, because it can be changed into another prime (22222121121721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11111060560560 + 11111060560561.

It is an arithmetic number, because the mean of its divisors is an integer number (11111060560561).

Almost surely, 2^{22222121121121} is an apocalyptic number.

It is an amenable number.

22222121121121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222121121121 is an equidigital number, since it uses as much as digits as its factorization.

22222121121121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 22.

Adding to 22222121121121 its reverse (12112112122222), we get a palindrome (34334233243343).

The spelling of 22222121121121 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".