221212314343123 has 2 divisors, whose sum is σ = 221212314343124. Its totient is φ = 221212314343122.

The previous prime is 221212314343117. The next prime is 221212314343157. The reversal of 221212314343123 is 321343413212122.

It is an a-pointer prime, because the next prime (221212314343157) can be obtained adding 221212314343123 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221212314343123 - 2¹⁷ = 221212314212051 is a prime.

It is not a weakly prime, because it can be changed into another prime (221212314343523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606157171561 + 110606157171562.

It is an arithmetic number, because the mean of its divisors is an integer number (110606157171562).

Almost surely, 2^{221212314343123} is an apocalyptic number.

221212314343123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221212314343123 is an equidigital number, since it uses as much as digits as its factorization.

221212314343123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 34.

Adding to 221212314343123 its reverse (321343413212122), we get a palindrome (542555727555245).

The spelling of 221212314343123 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred fourteen million, three hundred forty-three thousand, one hundred twenty-three".