21113223233 has 4 divisors (see below), whose sum is σ = 21274393008. Its totient is φ = 20952053460.

The previous prime is 21113223223. The next prime is 21113223239. The reversal of 21113223233 is 33232231112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21113223233 - 2⁴ = 21113223217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21113223199 and 21113223208.

It is not an unprimeable number, because it can be changed into a prime (21113223239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80584691 + ... + 80584952.

It is an arithmetic number, because the mean of its divisors is an integer number (5318598252).

Almost surely, 2^21113223233 is an apocalyptic number.

It is an amenable number.

21113223233 is a deficient number, since it is larger than the sum of its proper divisors (161169775).

21113223233 is a wasteful number, since it uses less digits than its factorization.

21113223233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161169774.

The product of its digits is 1296, while the sum is 23.

Adding to 21113223233 its reverse (33232231112), we get a palindrome (54345454345).

The spelling of 21113223233 in words is "twenty-one billion, one hundred thirteen million, two hundred twenty-three thousand, two hundred thirty-three".