12211001081 has 2 divisors, whose sum is σ = 12211001082. Its totient is φ = 12211001080.

The previous prime is 12211001017. The next prime is 12211001083. The reversal of 12211001081 is 18010011221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9778045456 + 2432955625 = 98884^2 + 49325^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211001081 - 2⁶ = 12211001017 is a prime.

It is a super-2 number, since 2×12211001081² (a number of 21 digits) contains 22 as substring.

Together with 12211001083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12211001083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105500540 + 6105500541.

It is an arithmetic number, because the mean of its divisors is an integer number (6105500541).

Almost surely, 2^12211001081 is an apocalyptic number.

It is an amenable number.

12211001081 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211001081 is an equidigital number, since it uses as much as digits as its factorization.

12211001081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

The spelling of 12211001081 in words is "twelve billion, two hundred eleven million, one thousand, eighty-one".