21330423233 has 8 divisors (see below), whose sum is σ = 24671333568. Its totient is φ = 18062939664.

The previous prime is 21330423229. The next prime is 21330423251. The reversal of 21330423233 is 33232403312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21330423233 - 2² = 21330423229 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21330423833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18356066 + ... + 18357227.

It is an arithmetic number, because the mean of its divisors is an integer number (3083916696).

Almost surely, 2^21330423233 is an apocalyptic number.

It is an amenable number.

21330423233 is a deficient number, since it is larger than the sum of its proper divisors (3340910335).

21330423233 is an equidigital number, since it uses as much as digits as its factorization.

21330423233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36713383.

The product of its (nonzero) digits is 7776, while the sum is 26.

Adding to 21330423233 its reverse (33232403312), we get a palindrome (54562826545).

The spelling of 21330423233 in words is "twenty-one billion, three hundred thirty million, four hundred twenty-three thousand, two hundred thirty-three".