211143213181 has 2 divisors, whose sum is σ = 211143213182. Its totient is φ = 211143213180.

The previous prime is 211143213097. The next prime is 211143213233. The reversal of 211143213181 is 181312341112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174313765081 + 36829448100 = 417509^2 + 191910^2 .

It is a cyclic number.

It is not a de Polignac number, because 211143213181 - 2⁹ = 211143212669 is a prime.

It is a super-2 number, since 2×211143213181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211143213481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105571606590 + 105571606591.

It is an arithmetic number, because the mean of its divisors is an integer number (105571606591).

Almost surely, 2^211143213181 is an apocalyptic number.

It is an amenable number.

211143213181 is a deficient number, since it is larger than the sum of its proper divisors (1).

211143213181 is an equidigital number, since it uses as much as digits as its factorization.

211143213181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 28.

Adding to 211143213181 its reverse (181312341112), we get a palindrome (392455554293).

The spelling of 211143213181 in words is "two hundred eleven billion, one hundred forty-three million, two hundred thirteen thousand, one hundred eighty-one".