2123042981 has 2 divisors, whose sum is σ = 2123042982. Its totient is φ = 2123042980.

The previous prime is 2123042951. The next prime is 2123042993. The reversal of 2123042981 is 1892403212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1160492356 + 962550625 = 34066^2 + 31025^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123042981 - 2¹⁴ = 2123026597 is a prime.

It is a super-2 number, since 2×2123042981² = 9014622998346732722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123042921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061521490 + 1061521491.

It is an arithmetic number, because the mean of its divisors is an integer number (1061521491).

Almost surely, 2^2123042981 is an apocalyptic number.

It is an amenable number.

2123042981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123042981 is an equidigital number, since it uses as much as digits as its factorization.

2123042981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 2123042981 is about 46076.4905456134. The cubic root of 2123042981 is about 1285.2460037626.

The spelling of 2123042981 in words is "two billion, one hundred twenty-three million, forty-two thousand, nine hundred eighty-one".