21231223333 has 6 divisors (see below), whose sum is σ = 22407468774. Its totient is φ = 20113790184.

The previous prime is 21231223291. The next prime is 21231223393. The reversal of 21231223333 is 33332213212.

It can be written as a sum of positive squares in only one way, i.e., 20561552449 + 669670884 = 143393^2 + 25878^2 .

It is not a de Polignac number, because 21231223333 - 2³³ = 12641288741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231223298 and 21231223307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231223393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29405766 + ... + 29406487.

It is an arithmetic number, because the mean of its divisors is an integer number (3734578129).

Almost surely, 2^21231223333 is an apocalyptic number.

It is an amenable number.

21231223333 is a deficient number, since it is larger than the sum of its proper divisors (1176245441).

21231223333 is an equidigital number, since it uses as much as digits as its factorization.

21231223333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58812291 (or 58812272 counting only the distinct ones).

The product of its digits is 3888, while the sum is 25.

Adding to 21231223333 its reverse (33332213212), we get a palindrome (54563436545).

The spelling of 21231223333 in words is "twenty-one billion, two hundred thirty-one million, two hundred twenty-three thousand, three hundred thirty-three".