21242112233 has 4 divisors (see below), whose sum is σ = 22360118160. Its totient is φ = 20124106308.

The previous prime is 21242112131. The next prime is 21242112251. The reversal of 21242112233 is 33221124212.

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 21242112233 - 2¹⁸ = 21241850089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21242112199 and 21242112208.

It is not an unprimeable number, because it can be changed into a prime (21242112293) 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, 559002935 + ... + 559002972.

It is an arithmetic number, because the mean of its divisors is an integer number (5590029540).

Almost surely, 2^21242112233 is an apocalyptic number.

It is an amenable number.

21242112233 is a deficient number, since it is larger than the sum of its proper divisors (1118005927).

21242112233 is a wasteful number, since it uses less digits than its factorization.

21242112233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118005926.

The product of its digits is 1152, while the sum is 23.

Adding to 21242112233 its reverse (33221124212), we get a palindrome (54463236445).

The spelling of 21242112233 in words is "twenty-one billion, two hundred forty-two million, one hundred twelve thousand, two hundred thirty-three".