111012201221 has 2 divisors, whose sum is σ = 111012201222. Its totient is φ = 111012201220.

The previous prime is 111012201203. The next prime is 111012201277. The reversal of 111012201221 is 122102210111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91817484196 + 19194717025 = 303014^2 + 138545^2 .

It is a cyclic number.

It is not a de Polignac number, because 111012201221 - 2¹⁰ = 111012200197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111012201196 and 111012201205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111012203221) 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, 55506100610 + 55506100611.

It is an arithmetic number, because the mean of its divisors is an integer number (55506100611).

Almost surely, 2^111012201221 is an apocalyptic number.

It is an amenable number.

111012201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111012201221 is an equidigital number, since it uses as much as digits as its factorization.

111012201221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111012201221 its reverse (122102210111), we get a palindrome (233114411332).

The spelling of 111012201221 in words is "one hundred eleven billion, twelve million, two hundred one thousand, two hundred twenty-one".