21003023323 has 16 divisors (see below), whose sum is σ = 21723227136. Its totient is φ = 20291351040.

The previous prime is 21003023297. The next prime is 21003023333. The reversal of 21003023323 is 32332030012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21003023323 - 2⁵ = 21003023291 is a prime.

It is a super-2 number, since 2×21003023323² (a number of 21 digits) contains 22 as substring.

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 21003023323.

It is not an unprimeable number, because it can be changed into a prime (21003023333) 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, 3298663 + ... + 3305023.

It is an arithmetic number, because the mean of its divisors is an integer number (1357701696).

Almost surely, 2^21003023323 is an apocalyptic number.

21003023323 is a deficient number, since it is larger than the sum of its proper divisors (720203813).

21003023323 is a wasteful number, since it uses less digits than its factorization.

21003023323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7014.

The product of its (nonzero) digits is 648, while the sum is 19.

Adding to 21003023323 its reverse (32332030012), we get a palindrome (53335053335).

The spelling of 21003023323 in words is "twenty-one billion, three million, twenty-three thousand, three hundred twenty-three".