1211212211311 has 2 divisors, whose sum is σ = 1211212211312. Its totient is φ = 1211212211310.

The previous prime is 1211212211303. The next prime is 1211212211359. The reversal of 1211212211311 is 1131122121121.

It is a m-pointer prime, because the next prime (1211212211359) can be obtained adding 1211212211311 to its product of digits (48).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211212211311 - 2³ = 1211212211303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211212211611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605606105655 + 605606105656.

It is an arithmetic number, because the mean of its divisors is an integer number (605606105656).

Almost surely, 2^{1211212211311} is an apocalyptic number.

1211212211311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211212211311 is an equidigital number, since it uses as much as digits as its factorization.

1211212211311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 19.

Adding to 1211212211311 its reverse (1131122121121), we get a palindrome (2342334332432).

The spelling of 1211212211311 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred eleven thousand, three hundred eleven".