21003102223 has 4 divisors (see below), whose sum is σ = 21004216288. Its totient is φ = 21001988160.

The previous prime is 21003102203. The next prime is 21003102229. The reversal of 21003102223 is 32220130012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21003102223 - 2¹⁷ = 21002971151 is a prime.

It is a super-2 number, since 2×21003102223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003102197 and 21003102206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003102229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528258 + ... + 566623.

It is an arithmetic number, because the mean of its divisors is an integer number (5251054072).

Almost surely, 2^21003102223 is an apocalyptic number.

21003102223 is a deficient number, since it is larger than the sum of its proper divisors (1114065).

21003102223 is a wasteful number, since it uses less digits than its factorization.

21003102223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114064.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21003102223 its reverse (32220130012), we get a palindrome (53223232235).

The spelling of 21003102223 in words is "twenty-one billion, three million, one hundred two thousand, two hundred twenty-three".