21003032223 has 48 divisors (see below), whose sum is σ = 31378314240. Its totient is φ = 13531542912.

The previous prime is 21003032173. The next prime is 21003032227. The reversal of 21003032223 is 32223030012.

It is a happy number.

It is not a de Polignac number, because 21003032223 - 2⁸ = 21003031967 is a prime.

It is a super-2 number, since 2×21003032223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003032196 and 21003032205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003032227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9827211 + ... + 9829347.

It is an arithmetic number, because the mean of its divisors is an integer number (653714880).

Almost surely, 2^21003032223 is an apocalyptic number.

21003032223 is a deficient number, since it is larger than the sum of its proper divisors (10375282017).

21003032223 is a wasteful number, since it uses less digits than its factorization.

21003032223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508 (or 2505 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21003032223 its reverse (32223030012), we get a palindrome (53226062235).

The spelling of 21003032223 in words is "twenty-one billion, three million, thirty-two thousand, two hundred twenty-three".