21030003223 has 2 divisors, whose sum is σ = 21030003224. Its totient is φ = 21030003222.

The previous prime is 21030003217. The next prime is 21030003227. The reversal of 21030003223 is 32230003012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21030003223 is a prime.

It is a super-2 number, since 2×21030003223² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21030003197 and 21030003206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030003227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515001611 + 10515001612.

It is an arithmetic number, because the mean of its divisors is an integer number (10515001612).

Almost surely, 2^21030003223 is an apocalyptic number.

21030003223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030003223 is an equidigital number, since it uses as much as digits as its factorization.

21030003223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21030003223 its reverse (32230003012), we get a palindrome (53260006235).

The spelling of 21030003223 in words is "twenty-one billion, thirty million, three thousand, two hundred twenty-three".