1200112721 has 2 divisors, whose sum is σ = 1200112722. Its totient is φ = 1200112720.

The previous prime is 1200112709. The next prime is 1200112729. The reversal of 1200112721 is 1272110021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1180884496 + 19228225 = 34364^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200112721 - 2⁶ = 1200112657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200112721.

It is not a weakly prime, because it can be changed into another prime (1200112729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600056360 + 600056361.

It is an arithmetic number, because the mean of its divisors is an integer number (600056361).

Almost surely, 2^1200112721 is an apocalyptic number.

It is an amenable number.

1200112721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200112721 is an equidigital number, since it uses as much as digits as its factorization.

1200112721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 1200112721 is about 34642.6431006642. The cubic root of 1200112721 is about 1062.6918414565.

Adding to 1200112721 its reverse (1272110021), we get a palindrome (2472222742).

The spelling of 1200112721 in words is "one billion, two hundred million, one hundred twelve thousand, seven hundred twenty-one".