21311310311311 has 2 divisors, whose sum is σ = 21311310311312. Its totient is φ = 21311310311310.

The previous prime is 21311310311303. The next prime is 21311310311341. The reversal of 21311310311311 is 11311301311312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21311310311311 - 2³ = 21311310311303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311310311341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655655155655 + 10655655155656.

It is an arithmetic number, because the mean of its divisors is an integer number (10655655155656).

Almost surely, 2^{21311310311311} is an apocalyptic number.

21311310311311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311310311311 is an equidigital number, since it uses as much as digits as its factorization.

21311310311311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

Adding to 21311310311311 its reverse (11311301311312), we get a palindrome (32622611622623).

The spelling of 21311310311311 in words is "twenty-one trillion, three hundred eleven billion, three hundred ten million, three hundred eleven thousand, three hundred eleven".