21323310311 has 2 divisors, whose sum is σ = 21323310312. Its totient is φ = 21323310310.

The previous prime is 21323310257. The next prime is 21323310313. The reversal of 21323310311 is 11301332312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21323310311 - 2⁶ = 21323310247 is a prime.

Together with 21323310313, 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 (21323310313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661655155 + 10661655156.

It is an arithmetic number, because the mean of its divisors is an integer number (10661655156).

Almost surely, 2^21323310311 is an apocalyptic number.

21323310311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323310311 is an equidigital number, since it uses as much as digits as its factorization.

21323310311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21323310311 its reverse (11301332312), we get a palindrome (32624642623).

The spelling of 21323310311 in words is "twenty-one billion, three hundred twenty-three million, three hundred ten thousand, three hundred eleven".