21002320223 has 8 divisors (see below), whose sum is σ = 21034782720. Its totient is φ = 20969879040.

The previous prime is 21002320153. The next prime is 21002320243. The reversal of 21002320223 is 32202320012.

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

It is a cyclic number.

It is not a de Polignac number, because 21002320223 - 2⁸ = 21002319967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002320243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4100258 + ... + 4105376.

It is an arithmetic number, because the mean of its divisors is an integer number (2629347840).

Almost surely, 2^21002320223 is an apocalyptic number.

21002320223 is a deficient number, since it is larger than the sum of its proper divisors (32462497).

21002320223 is an equidigital number, since it uses as much as digits as its factorization.

21002320223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10657.

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21002320223 its reverse (32202320012), we get a palindrome (53204640235).

The spelling of 21002320223 in words is "twenty-one billion, two million, three hundred twenty thousand, two hundred twenty-three".