2122212221081 has 2 divisors, whose sum is σ = 2122212221082. Its totient is φ = 2122212221080.

The previous prime is 2122212221009. The next prime is 2122212221203. The reversal of 2122212221081 is 1801222122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1391727481225 + 730484739856 = 1179715^2 + 854684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2122212221081 is a prime.

It is a super-2 number, since 2×2122212221081² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2122212221081.

It is not a weakly prime, because it can be changed into another prime (2122212227081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061106110540 + 1061106110541.

It is an arithmetic number, because the mean of its divisors is an integer number (1061106110541).

Almost surely, 2^{2122212221081} is an apocalyptic number.

It is an amenable number.

2122212221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122212221081 is an equidigital number, since it uses as much as digits as its factorization.

2122212221081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 26.

Adding to 2122212221081 its reverse (1801222122212), we get a palindrome (3923434343293).

The spelling of 2122212221081 in words is "two trillion, one hundred twenty-two billion, two hundred twelve million, two hundred twenty-one thousand, eighty-one".