2142301981 has 2 divisors, whose sum is σ = 2142301982. Its totient is φ = 2142301980.

The previous prime is 2142301969. The next prime is 2142302021. The reversal of 2142301981 is 1891032412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1174158756 + 968143225 = 34266^2 + 31115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142301981 - 2⁷ = 2142301853 is a prime.

It is a super-2 number, since 2×2142301981² = 9178915555593048722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2142301901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071150990 + 1071150991.

It is an arithmetic number, because the mean of its divisors is an integer number (1071150991).

Almost surely, 2^2142301981 is an apocalyptic number.

It is an amenable number.

2142301981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142301981 is an equidigital number, since it uses as much as digits as its factorization.

2142301981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 2142301981 is about 46285.0081667920. The cubic root of 2142301981 is about 1289.1206436180.

The spelling of 2142301981 in words is "two billion, one hundred forty-two million, three hundred one thousand, nine hundred eighty-one".