221103112121 has 2 divisors, whose sum is σ = 221103112122. Its totient is φ = 221103112120.

The previous prime is 221103112093. The next prime is 221103112187. The reversal of 221103112121 is 121211301122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181037485225 + 40065626896 = 425485^2 + 200164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221103112121 is a prime.

It is a super-3 number, since 3×221103112121³ (a number of 35 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221103112121.

It is not a weakly prime, because it can be changed into another prime (221103111121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551556060 + 110551556061.

It is an arithmetic number, because the mean of its divisors is an integer number (110551556061).

Almost surely, 2^221103112121 is an apocalyptic number.

It is an amenable number.

221103112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221103112121 is an equidigital number, since it uses as much as digits as its factorization.

221103112121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 221103112121 its reverse (121211301122), we get a palindrome (342314413243).

The spelling of 221103112121 in words is "two hundred twenty-one billion, one hundred three million, one hundred twelve thousand, one hundred twenty-one".