21003323223 has 16 divisors (see below), whose sum is σ = 28103644800. Its totient is φ = 13952663136.

The previous prime is 21003323191. The next prime is 21003323233. The reversal of 21003323223 is 32232330012.

It is not a de Polignac number, because 21003323223 - 2⁵ = 21003323191 is a prime.

It is a super-2 number, since 2×21003323223² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003323223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003323233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1812853 + ... + 1824401.

It is an arithmetic number, because the mean of its divisors is an integer number (1756477800).

Almost surely, 2^21003323223 is an apocalyptic number.

21003323223 is a deficient number, since it is larger than the sum of its proper divisors (7100321577).

21003323223 is a wasteful number, since it uses less digits than its factorization.

21003323223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13646.

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

Adding to 21003323223 its reverse (32232330012), we get a palindrome (53235653235).

The spelling of 21003323223 in words is "twenty-one billion, three million, three hundred twenty-three thousand, two hundred twenty-three".