21033340323 has 8 divisors (see below), whose sum is σ = 28045165248. Its totient is φ = 14021871144.

The previous prime is 21033340297. The next prime is 21033340327. The reversal of 21033340323 is 32304333012.

It is a happy number.

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

It is not a de Polignac number, because 21033340323 - 2⁵ = 21033340291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033340293 and 21033340302.

It is not an unprimeable number, because it can be changed into a prime (21033340327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117436 + ... + 236342.

It is an arithmetic number, because the mean of its divisors is an integer number (3505645656).

Almost surely, 2^21033340323 is an apocalyptic number.

21033340323 is a deficient number, since it is larger than the sum of its proper divisors (7011824925).

21033340323 is a wasteful number, since it uses less digits than its factorization.

21033340323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177873.

The product of its (nonzero) digits is 3888, while the sum is 24.

Adding to 21033340323 its reverse (32304333012), we get a palindrome (53337673335).

The spelling of 21033340323 in words is "twenty-one billion, thirty-three million, three hundred forty thousand, three hundred twenty-three".