21333211233 has 4 divisors (see below), whose sum is σ = 28444281648. Its totient is φ = 14222140820.

The previous prime is 21333211187. The next prime is 21333211297. The reversal of 21333211233 is 33211233312.

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 21333211233 - 2¹⁰ = 21333210209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21333211733) 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, 3555535203 + ... + 3555535208.

It is an arithmetic number, because the mean of its divisors is an integer number (7111070412).

Almost surely, 2^21333211233 is an apocalyptic number.

It is an amenable number.

21333211233 is a deficient number, since it is larger than the sum of its proper divisors (7111070415).

21333211233 is an equidigital number, since it uses as much as digits as its factorization.

21333211233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7111070414.

The product of its digits is 1944, while the sum is 24.

Adding to 21333211233 its reverse (33211233312), we get a palindrome (54544444545).

The spelling of 21333211233 in words is "twenty-one billion, three hundred thirty-three million, two hundred eleven thousand, two hundred thirty-three".