21303213111311 has 2 divisors, whose sum is σ = 21303213111312. Its totient is φ = 21303213111310.

The previous prime is 21303213111251. The next prime is 21303213111403. The reversal of 21303213111311 is 11311131230312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21303213111311 - 2²⁶ = 21303146002447 is a prime.

It is a super-2 number, since 2×21303213111311² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303213111811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651606555655 + 10651606555656.

It is an arithmetic number, because the mean of its divisors is an integer number (10651606555656).

Almost surely, 2^{21303213111311} is an apocalyptic number.

21303213111311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303213111311 is an equidigital number, since it uses as much as digits as its factorization.

21303213111311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

Adding to 21303213111311 its reverse (11311131230312), we get a palindrome (32614344341623).

The spelling of 21303213111311 in words is "twenty-one trillion, three hundred three billion, two hundred thirteen million, one hundred eleven thousand, three hundred eleven".