21033220323 has 4 divisors (see below), whose sum is σ = 28044293768. Its totient is φ = 14022146880.

The previous prime is 21033220279. The next prime is 21033220333. The reversal of 21033220323 is 32302233012.

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

It is not a de Polignac number, because 21033220323 - 2⁶ = 21033220259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21033220323.

It is not an unprimeable number, because it can be changed into a prime (21033220333) 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, 3505536718 + ... + 3505536723.

It is an arithmetic number, because the mean of its divisors is an integer number (7011073442).

Almost surely, 2^21033220323 is an apocalyptic number.

21033220323 is a deficient number, since it is larger than the sum of its proper divisors (7011073445).

21033220323 is an equidigital number, since it uses as much as digits as its factorization.

21033220323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7011073444.

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 21033220323 its reverse (32302233012), we get a palindrome (53335453335).

The spelling of 21033220323 in words is "twenty-one billion, thirty-three million, two hundred twenty thousand, three hundred twenty-three".