21311222211311 has 2 divisors, whose sum is σ = 21311222211312. Its totient is φ = 21311222211310.

The previous prime is 21311222211241. The next prime is 21311222211379. The reversal of 21311222211311 is 11311222211312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21311222211311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311222211511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655611105655 + 10655611105656.

It is an arithmetic number, because the mean of its divisors is an integer number (10655611105656).

Almost surely, 2^{21311222211311} is an apocalyptic number.

21311222211311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311222211311 is an equidigital number, since it uses as much as digits as its factorization.

21311222211311 is an evil number, because the sum of its binary digits is even.

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

Adding to 21311222211311 its reverse (11311222211312), we get a palindrome (32622444422623).

Subtracting from 21311222211311 its reverse (11311222211312), we obtain a palindrome (9999999999999).

The spelling of 21311222211311 in words is "twenty-one trillion, three hundred eleven billion, two hundred twenty-two million, two hundred eleven thousand, three hundred eleven".