2120012981 has 2 divisors, whose sum is σ = 2120012982. Its totient is φ = 2120012980.

The previous prime is 2120012969. The next prime is 2120013011. The reversal of 2120012981 is 1892100212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2109932356 + 10080625 = 45934^2 + 3175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120012981 - 2¹⁸ = 2119750837 is a prime.

It is a super-2 number, since 2×2120012981² = 8988910079217012722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2120012981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120012581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060006490 + 1060006491.

It is an arithmetic number, because the mean of its divisors is an integer number (1060006491).

Almost surely, 2^2120012981 is an apocalyptic number.

It is an amenable number.

2120012981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120012981 is an equidigital number, since it uses as much as digits as its factorization.

2120012981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 2120012981 is about 46043.5986973217. The cubic root of 2120012981 is about 1284.6342796888.

The spelling of 2120012981 in words is "two billion, one hundred twenty million, twelve thousand, nine hundred eighty-one".