21303210231311 has 2 divisors, whose sum is σ = 21303210231312. Its totient is φ = 21303210231310.

The previous prime is 21303210231301. The next prime is 21303210231389. The reversal of 21303210231311 is 11313201230312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303210231311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303210231301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651605115655 + 10651605115656.

It is an arithmetic number, because the mean of its divisors is an integer number (10651605115656).

Almost surely, 2^{21303210231311} is an apocalyptic number.

21303210231311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303210231311 is an equidigital number, since it uses as much as digits as its factorization.

21303210231311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21303210231311 its reverse (11313201230312), we get a palindrome (32616411461623).

Subtracting from 21303210231311 its reverse (11313201230312), we obtain a palindrome (9990009000999).

The spelling of 21303210231311 in words is "twenty-one trillion, three hundred three billion, two hundred ten million, two hundred thirty-one thousand, three hundred eleven".