2122012121981 has 2 divisors, whose sum is σ = 2122012121982. Its totient is φ = 2122012121980.

The previous prime is 2122012121969. The next prime is 2122012122029. The reversal of 2122012121981 is 1891212102212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1391857252900 + 730154869081 = 1179770^2 + 854491^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122012121981 - 2¹⁰ = 2122012120957 is a prime.

It is a super-2 number, since 2×2122012121981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122012121951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061006060990 + 1061006060991.

It is an arithmetic number, because the mean of its divisors is an integer number (1061006060991).

Almost surely, 2^{2122012121981} is an apocalyptic number.

It is an amenable number.

2122012121981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122012121981 is an equidigital number, since it uses as much as digits as its factorization.

2122012121981 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 32.

The spelling of 2122012121981 in words is "two trillion, one hundred twenty-two billion, twelve million, one hundred twenty-one thousand, nine hundred eighty-one".