1221134311211 has 2 divisors, whose sum is σ = 1221134311212. Its totient is φ = 1221134311210.

The previous prime is 1221134311181. The next prime is 1221134311237. The reversal of 1221134311211 is 1121134311221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1121134311221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221134311211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221134311291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610567155605 + 610567155606.

It is an arithmetic number, because the mean of its divisors is an integer number (610567155606).

Almost surely, 2^{1221134311211} is an apocalyptic number.

1221134311211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221134311211 is an equidigital number, since it uses as much as digits as its factorization.

1221134311211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

Adding to 1221134311211 its reverse (1121134311221), we get a palindrome (2342268622432).

The spelling of 1221134311211 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-four million, three hundred eleven thousand, two hundred eleven".