111100212012221 has 2 divisors, whose sum is σ = 111100212012222. Its totient is φ = 111100212012220.

The previous prime is 111100212012211. The next prime is 111100212012241. The reversal of 111100212012221 is 122210212001111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74915343283225 + 36184868728996 = 8655365^2 + 6015386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111100212012221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111100212012221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111100212012211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550106006110 + 55550106006111.

It is an arithmetic number, because the mean of its divisors is an integer number (55550106006111).

Almost surely, 2^{111100212012221} is an apocalyptic number.

It is an amenable number.

111100212012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111100212012221 is an equidigital number, since it uses as much as digits as its factorization.

111100212012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111100212012221 its reverse (122210212001111), we get a palindrome (233310424013332).

The spelling of 111100212012221 in words is "one hundred eleven trillion, one hundred billion, two hundred twelve million, twelve thousand, two hundred twenty-one".