21233011511 has 2 divisors, whose sum is σ = 21233011512. Its totient is φ = 21233011510.

The previous prime is 21233011469. The next prime is 21233011589. The reversal of 21233011511 is 11511033212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21233011511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233017511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616505755 + 10616505756.

It is an arithmetic number, because the mean of its divisors is an integer number (10616505756).

Almost surely, 2^21233011511 is an apocalyptic number.

21233011511 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233011511 is an equidigital number, since it uses as much as digits as its factorization.

21233011511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 21233011511 its reverse (11511033212), we get a palindrome (32744044723).

The spelling of 21233011511 in words is "twenty-one billion, two hundred thirty-three million, eleven thousand, five hundred eleven".