21440033323 has 4 divisors (see below), whose sum is σ = 21448420720. Its totient is φ = 21431645928.

The previous prime is 21440033273. The next prime is 21440033347. The reversal of 21440033323 is 32333004412.

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 21440033323 - 2⁹ = 21440032811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440033383) 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, 4189863 + ... + 4194976.

It is an arithmetic number, because the mean of its divisors is an integer number (5362105180).

Almost surely, 2^21440033323 is an apocalyptic number.

21440033323 is a deficient number, since it is larger than the sum of its proper divisors (8387397).

21440033323 is an equidigital number, since it uses as much as digits as its factorization.

21440033323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8387396.

The product of its (nonzero) digits is 5184, while the sum is 25.

Adding to 21440033323 its reverse (32333004412), we get a palindrome (53773037735).

The spelling of 21440033323 in words is "twenty-one billion, four hundred forty million, thirty-three thousand, three hundred twenty-three".