21003232223 has 16 divisors (see below), whose sum is σ = 22319621280. Its totient is φ = 19730006016.

The previous prime is 21003232213. The next prime is 21003232241. The reversal of 21003232223 is 32223230012.

It is a cyclic number.

It is not a de Polignac number, because 21003232223 - 2³² = 16708264927 is a prime.

It is a super-2 number, since 2×21003232223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003232195 and 21003232204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003232213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287711 + ... + 353247.

It is an arithmetic number, because the mean of its divisors is an integer number (1394976330).

Almost surely, 2^21003232223 is an apocalyptic number.

21003232223 is a deficient number, since it is larger than the sum of its proper divisors (1316389057).

21003232223 is a wasteful number, since it uses less digits than its factorization.

21003232223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65866.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21003232223 its reverse (32223230012), we get a palindrome (53226462235).

It can be divided in two parts, 2100 and 3232223, that added together give a palindrome (3234323).

The spelling of 21003232223 in words is "twenty-one billion, three million, two hundred thirty-two thousand, two hundred twenty-three".