21202112233 has 4 divisors (see below), whose sum is σ = 21202979728. Its totient is φ = 21201244740.

The previous prime is 21202112221. The next prime is 21202112291. The reversal of 21202112233 is 33221120212.

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 21202112233 - 2⁵ = 21202112201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202112233.

It is not an unprimeable number, because it can be changed into a prime (21202112933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395991 + ... + 446332.

It is an arithmetic number, because the mean of its divisors is an integer number (5300744932).

Almost surely, 2^21202112233 is an apocalyptic number.

It is an amenable number.

21202112233 is a deficient number, since it is larger than the sum of its proper divisors (867495).

21202112233 is an equidigital number, since it uses as much as digits as its factorization.

21202112233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867494.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21202112233 its reverse (33221120212), we get a palindrome (54423232445).

The spelling of 21202112233 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, two hundred thirty-three".