21212332223 has 2 divisors, whose sum is σ = 21212332224. Its totient is φ = 21212332222.

The previous prime is 21212332217. The next prime is 21212332247. The reversal of 21212332223 is 32223321212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21212332223 - 2⁶ = 21212332159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21212332283) 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, 10606166111 + 10606166112.

It is an arithmetic number, because the mean of its divisors is an integer number (10606166112).

Almost surely, 2^21212332223 is an apocalyptic number.

21212332223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21212332223 is an equidigital number, since it uses as much as digits as its factorization.

21212332223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 23.

Adding to 21212332223 its reverse (32223321212), we get a palindrome (53435653435).

The spelling of 21212332223 in words is "twenty-one billion, two hundred twelve million, three hundred thirty-two thousand, two hundred twenty-three".