2143042021 has 2 divisors, whose sum is σ = 2143042022. Its totient is φ = 2143042020.

The previous prime is 2143042007. The next prime is 2143042037. The reversal of 2143042021 is 1202403412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1422119521 + 720922500 = 37711^2 + 26850^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143042021 - 2⁷ = 2143041893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2143042021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143042001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071521010 + 1071521011.

It is an arithmetic number, because the mean of its divisors is an integer number (1071521011).

Almost surely, 2^2143042021 is an apocalyptic number.

It is an amenable number.

2143042021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143042021 is an equidigital number, since it uses as much as digits as its factorization.

2143042021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2143042021 is about 46293.0018577322. The cubic root of 2143042021 is about 1289.2690651167.

Adding to 2143042021 its reverse (1202403412), we get a palindrome (3345445433).

The spelling of 2143042021 in words is "two billion, one hundred forty-three million, forty-two thousand, twenty-one".