21222222223 has 2 divisors, whose sum is σ = 21222222224. Its totient is φ = 21222222222.

The previous prime is 21222222209. The next prime is 21222222233. The reversal of 21222222223 is 32222222212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222222223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222222194 and 21222222203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222222233) 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 as a sum of consecutive naturals, namely, 10611111111 + 10611111112.

It is an arithmetic number, because the mean of its divisors is an integer number (10611111112).

Almost surely, 2^21222222223 is an apocalyptic number.

21222222223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222222223 is an equidigital number, since it uses as much as digits as its factorization.

21222222223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 22.

Adding to 21222222223 its reverse (32222222212), we get a palindrome (53444444435).

The spelling of 21222222223 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-three".