21330203223 has 32 divisors (see below), whose sum is σ = 33398510080. Its totient is φ = 11853267840.

The previous prime is 21330203203. The next prime is 21330203233. The reversal of 21330203223 is 32230203312.

It is not a de Polignac number, because 21330203223 - 2¹⁶ = 21330137687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 21330203223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330203203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1850508 + ... + 1861998.

It is an arithmetic number, because the mean of its divisors is an integer number (1043703440).

Almost surely, 2^21330203223 is an apocalyptic number.

21330203223 is a deficient number, since it is larger than the sum of its proper divisors (12068306857).

21330203223 is a wasteful number, since it uses less digits than its factorization.

21330203223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13927.

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

Adding to 21330203223 its reverse (32230203312), we get a palindrome (53560406535).

The spelling of 21330203223 in words is "twenty-one billion, three hundred thirty million, two hundred three thousand, two hundred twenty-three".