21321211212311 has 2 divisors, whose sum is σ = 21321211212312. Its totient is φ = 21321211212310.

The previous prime is 21321211212247. The next prime is 21321211212313. The reversal of 21321211212311 is 11321211212312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321211212311 - 2⁶ = 21321211212247 is a prime.

Together with 21321211212313, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321211212313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660605606155 + 10660605606156.

It is an arithmetic number, because the mean of its divisors is an integer number (10660605606156).

Almost surely, 2^{21321211212311} is an apocalyptic number.

21321211212311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321211212311 is an equidigital number, since it uses as much as digits as its factorization.

21321211212311 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 21321211212311 its reverse (11321211212312), we get a palindrome (32642422424623).

Subtracting from 21321211212311 its reverse (11321211212312), we obtain a palindrome (9999999999999).

The spelling of 21321211212311 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, three hundred eleven".