21223221223 has 2 divisors, whose sum is σ = 21223221224. Its totient is φ = 21223221222.

The previous prime is 21223221211. The next prime is 21223221233. The reversal of 21223221223 is 32212232212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21223221223 - 2¹⁷ = 21223090151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223221194 and 21223221203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223221233) 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, 10611610611 + 10611610612.

It is an arithmetic number, because the mean of its divisors is an integer number (10611610612).

Almost surely, 2^21223221223 is an apocalyptic number.

21223221223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223221223 is an equidigital number, since it uses as much as digits as its factorization.

21223221223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

Adding to 21223221223 its reverse (32212232212), we get a palindrome (53435453435).

The spelling of 21223221223 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty-one thousand, two hundred twenty-three".