11211121311311 has 2 divisors, whose sum is σ = 11211121311312. Its totient is φ = 11211121311310.

The previous prime is 11211121311301. The next prime is 11211121311347. The reversal of 11211121311311 is 11311312111211.

It is a m-pointer prime, because the next prime (11211121311347) can be obtained adding 11211121311311 to its product of digits (36).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211121311311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211121311301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605560655655 + 5605560655656.

It is an arithmetic number, because the mean of its divisors is an integer number (5605560655656).

Almost surely, 2^{11211121311311} is an apocalyptic number.

11211121311311 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211121311311 is an equidigital number, since it uses as much as digits as its factorization.

11211121311311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 20.

Adding to 11211121311311 its reverse (11311312111211), we get a palindrome (22522433422522).

The spelling of 11211121311311 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-one million, three hundred eleven thousand, three hundred eleven".