21330023111 has 2 divisors, whose sum is σ = 21330023112. Its totient is φ = 21330023110.

The previous prime is 21330023101. The next prime is 21330023123. The reversal of 21330023111 is 11132003312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21330023111 - 2²⁶ = 21262914247 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21330023111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330023101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665011555 + 10665011556.

It is an arithmetic number, because the mean of its divisors is an integer number (10665011556).

Almost surely, 2^21330023111 is an apocalyptic number.

21330023111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330023111 is an equidigital number, since it uses as much as digits as its factorization.

21330023111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21330023111 its reverse (11132003312), we get a palindrome (32462026423).

The spelling of 21330023111 in words is "twenty-one billion, three hundred thirty million, twenty-three thousand, one hundred eleven".