1211342213 has 2 divisors, whose sum is σ = 1211342214. Its totient is φ = 1211342212.

The previous prime is 1211342203. The next prime is 1211342221. The reversal of 1211342213 is 3122431121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639988804 + 571353409 = 25298^2 + 23903^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211342213 - 2¹⁰ = 1211341189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211342203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605671106 + 605671107.

It is an arithmetic number, because the mean of its divisors is an integer number (605671107).

Almost surely, 2^1211342213 is an apocalyptic number.

It is an amenable number.

1211342213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211342213 is an equidigital number, since it uses as much as digits as its factorization.

1211342213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 1211342213 is about 34804.3418699449. The cubic root of 1211342213 is about 1065.9961036129.

Adding to 1211342213 its reverse (3122431121), we get a palindrome (4333773334).

The spelling of 1211342213 in words is "one billion, two hundred eleven million, three hundred forty-two thousand, two hundred thirteen".