21220012223 has 2 divisors, whose sum is σ = 21220012224. Its totient is φ = 21220012222.

The previous prime is 21220012207. The next prime is 21220012241. The reversal of 21220012223 is 32221002212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220012223 - 2⁴ = 21220012207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220012243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610006111 + 10610006112.

It is an arithmetic number, because the mean of its divisors is an integer number (10610006112).

Almost surely, 2^21220012223 is an apocalyptic number.

21220012223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220012223 is an equidigital number, since it uses as much as digits as its factorization.

21220012223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21220012223 its reverse (32221002212), we get a palindrome (53441014435).

The spelling of 21220012223 in words is "twenty-one billion, two hundred twenty million, twelve thousand, two hundred twenty-three".