21233430110221 has 4 divisors (see below), whose sum is σ = 24266777268832. Its totient is φ = 18200082951612.

The previous prime is 21233430110213. The next prime is 21233430110273. The reversal of 21233430110221 is 12201103433212.

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 21233430110221 - 2³ = 21233430110213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233430110821) 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, 1516673579295 + ... + 1516673579308.

It is an arithmetic number, because the mean of its divisors is an integer number (6066694317208).

Almost surely, 2^{21233430110221} is an apocalyptic number.

It is an amenable number.

21233430110221 is a deficient number, since it is larger than the sum of its proper divisors (3033347158611).

21233430110221 is an equidigital number, since it uses as much as digits as its factorization.

21233430110221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033347158610.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21233430110221 its reverse (12201103433212), we get a palindrome (33434533543433).

The spelling of 21233430110221 in words is "twenty-one trillion, two hundred thirty-three billion, four hundred thirty million, one hundred ten thousand, two hundred twenty-one".