213143042081 has 2 divisors, whose sum is σ = 213143042082. Its totient is φ = 213143042080.

The previous prime is 213143042023. The next prime is 213143042087. The reversal of 213143042081 is 180240341312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161450472481 + 51692569600 = 401809^2 + 227360^2 .

It is a cyclic number.

It is not a de Polignac number, because 213143042081 - 2¹⁰ = 213143041057 is a prime.

It is a super-2 number, since 2×213143042081² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (213143042087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106571521040 + 106571521041.

It is an arithmetic number, because the mean of its divisors is an integer number (106571521041).

Almost surely, 2^213143042081 is an apocalyptic number.

It is an amenable number.

213143042081 is a deficient number, since it is larger than the sum of its proper divisors (1).

213143042081 is an equidigital number, since it uses as much as digits as its factorization.

213143042081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 213143042081 its reverse (180240341312), we get a palindrome (393383383393).

The spelling of 213143042081 in words is "two hundred thirteen billion, one hundred forty-three million, forty-two thousand, eighty-one".