1112212011721 has 2 divisors, whose sum is σ = 1112212011722. Its totient is φ = 1112212011720.

The previous prime is 1112212011707. The next prime is 1112212011751. The reversal of 1112212011721 is 1271102122111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 940288999225 + 171923012496 = 969685^2 + 414636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1112212011721 - 2⁵ = 1112212011689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1112212011692 and 1112212011701.

It is not a weakly prime, because it can be changed into another prime (1112212011751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 556106005860 + 556106005861.

It is an arithmetic number, because the mean of its divisors is an integer number (556106005861).

Almost surely, 2^{1112212011721} is an apocalyptic number.

It is an amenable number.

1112212011721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1112212011721 is an equidigital number, since it uses as much as digits as its factorization.

1112212011721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 22.

Adding to 1112212011721 its reverse (1271102122111), we get a palindrome (2383314133832).

The spelling of 1112212011721 in words is "one trillion, one hundred twelve billion, two hundred twelve million, eleven thousand, seven hundred twenty-one".