21433212223 has 4 divisors (see below), whose sum is σ = 21450237480. Its totient is φ = 21416186968.

The previous prime is 21433212221. The next prime is 21433212263. The reversal of 21433212223 is 32221233412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21433212223 - 2¹ = 21433212221 is a prime.

It is a super-3 number, since 3×21433212223³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433212221) 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, 8510740 + ... + 8513257.

It is an arithmetic number, because the mean of its divisors is an integer number (5362559370).

Almost surely, 2^21433212223 is an apocalyptic number.

21433212223 is a deficient number, since it is larger than the sum of its proper divisors (17025257).

21433212223 is a wasteful number, since it uses less digits than its factorization.

21433212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17025256.

The product of its digits is 3456, while the sum is 25.

Adding to 21433212223 its reverse (32221233412), we get a palindrome (53654445635).

The spelling of 21433212223 in words is "twenty-one billion, four hundred thirty-three million, two hundred twelve thousand, two hundred twenty-three".