21003122223 has 12 divisors (see below), whose sum is σ = 30441389160. Its totient is φ = 13954291056.

The previous prime is 21003122213. The next prime is 21003122237. The reversal of 21003122223 is 32222130012.

It is not a de Polignac number, because 21003122223 - 2⁶ = 21003122159 is a prime.

It is a super-2 number, since 2×21003122223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003122196 and 21003122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003122213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3979753 + ... + 3985026.

It is an arithmetic number, because the mean of its divisors is an integer number (2536782430).

Almost surely, 2^21003122223 is an apocalyptic number.

21003122223 is a deficient number, since it is larger than the sum of its proper divisors (9438266937).

21003122223 is a wasteful number, since it uses less digits than its factorization.

21003122223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7965078 (or 7965075 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21003122223 its reverse (32222130012), we get a palindrome (53225252235).

The spelling of 21003122223 in words is "twenty-one billion, three million, one hundred twenty-two thousand, two hundred twenty-three".