221212212103 has 2 divisors, whose sum is σ = 221212212104. Its totient is φ = 221212212102.

The previous prime is 221212212101. The next prime is 221212212113. The reversal of 221212212103 is 301212212122.

221212212103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221212212103 - 2¹ = 221212212101 is a prime.

Together with 221212212101, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221212212101) 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, 110606106051 + 110606106052.

It is an arithmetic number, because the mean of its divisors is an integer number (110606106052).

Almost surely, 2^221212212103 is an apocalyptic number.

221212212103 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212212103 is an equidigital number, since it uses as much as digits as its factorization.

221212212103 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 19.

Adding to 221212212103 its sum of digits (19), we get a palindrome (221212212122).

Adding to 221212212103 its reverse (301212212122), we get a palindrome (522424424225).

The spelling of 221212212103 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred three".