1112111201221 has 2 divisors, whose sum is σ = 1112111201222. Its totient is φ = 1112111201220.

The previous prime is 1112111201209. The next prime is 1112111201237. The reversal of 1112111201221 is 1221021112111.

It is an a-pointer prime, because the next prime (1112111201237) can be obtained adding 1112111201221 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995782456321 + 116328744900 = 997889^2 + 341070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1112111201221 - 2²¹ = 1112109104069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1112111201195 and 1112111201204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1112111201261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556055600610 + 556055600611.

It is an arithmetic number, because the mean of its divisors is an integer number (556055600611).

Almost surely, 2^{1112111201221} is an apocalyptic number.

It is an amenable number.

1112111201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1112111201221 is an equidigital number, since it uses as much as digits as its factorization.

1112111201221 is an evil number, because the sum of its binary digits is even.

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

Adding to 1112111201221 its reverse (1221021112111), we get a palindrome (2333132313332).

The spelling of 1112111201221 in words is "one trillion, one hundred twelve billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".