21003013223 has 2 divisors, whose sum is σ = 21003013224. Its totient is φ = 21003013222.

The previous prime is 21003013219. The next prime is 21003013237. The reversal of 21003013223 is 32231030012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21003013223 - 2² = 21003013219 is a prime.

It is a super-2 number, since 2×21003013223² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003013243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501506611 + 10501506612.

It is an arithmetic number, because the mean of its divisors is an integer number (10501506612).

Almost surely, 2^21003013223 is an apocalyptic number.

21003013223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003013223 is an equidigital number, since it uses as much as digits as its factorization.

21003013223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21003013223 its reverse (32231030012), we get a palindrome (53234043235).

The spelling of 21003013223 in words is "twenty-one billion, three million, thirteen thousand, two hundred twenty-three".