21343221311 has 2 divisors, whose sum is σ = 21343221312. Its totient is φ = 21343221310.

The previous prime is 21343221301. The next prime is 21343221313. The reversal of 21343221311 is 11312234312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21343221311 - 2¹⁸ = 21342959167 is a prime.

Together with 21343221313, 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 (21343221313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671610655 + 10671610656.

It is an arithmetic number, because the mean of its divisors is an integer number (10671610656).

Almost surely, 2^21343221311 is an apocalyptic number.

21343221311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343221311 is an equidigital number, since it uses as much as digits as its factorization.

21343221311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

Adding to 21343221311 its reverse (11312234312), we get a palindrome (32655455623).

The spelling of 21343221311 in words is "twenty-one billion, three hundred forty-three million, two hundred twenty-one thousand, three hundred eleven".