21023231311 has 2 divisors, whose sum is σ = 21023231312. Its totient is φ = 21023231310.

The previous prime is 21023231293. The next prime is 21023231353. The reversal of 21023231311 is 11313232012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21023231311 - 2¹¹ = 21023229263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21023231111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511615655 + 10511615656.

It is an arithmetic number, because the mean of its divisors is an integer number (10511615656).

Almost surely, 2^21023231311 is an apocalyptic number.

21023231311 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023231311 is an equidigital number, since it uses as much as digits as its factorization.

21023231311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21023231311 its reverse (11313232012), we get a palindrome (32336463323).

The spelling of 21023231311 in words is "twenty-one billion, twenty-three million, two hundred thirty-one thousand, three hundred eleven".