12220120021981 has 2 divisors, whose sum is σ = 12220120021982. Its totient is φ = 12220120021980.

The previous prime is 12220120021969. The next prime is 12220120022023. The reversal of 12220120021981 is 18912002102221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11811140586756 + 408979435225 = 3436734^2 + 639515^2 .

It is an emirp because it is prime and its reverse (18912002102221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12220120021981 - 2⁷ = 12220120021853 is a prime.

It is a super-2 number, since 2×12220120021981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220120021931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110060010990 + 6110060010991.

It is an arithmetic number, because the mean of its divisors is an integer number (6110060010991).

Almost surely, 2^{12220120021981} is an apocalyptic number.

It is an amenable number.

12220120021981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220120021981 is an equidigital number, since it uses as much as digits as its factorization.

12220120021981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The spelling of 12220120021981 in words is "twelve trillion, two hundred twenty billion, one hundred twenty million, twenty-one thousand, nine hundred eighty-one".