1200021201 has 6 divisors (see below), whose sum is σ = 1733363970. Its totient is φ = 800014128.

The previous prime is 1200021187. The next prime is 1200021217. The reversal of 1200021201 is 1021200021.

It can be written as a sum of positive squares in only one way, i.e., 1144130625 + 55890576 = 33825^2 + 7476^2 .

It is not a de Polignac number, because 1200021201 - 2¹⁰ = 1200020177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 133335689 = 1200021201 / (1 + 2 + 0 + 0 + 0 + 2 + 1 + 2 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1200021271) 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 in 5 ways as a sum of consecutive naturals, for example, 66667836 + ... + 66667853.

It is an arithmetic number, because the mean of its divisors is an integer number (288893995).

Almost surely, 2^1200021201 is an apocalyptic number.

It is an amenable number.

1200021201 is a deficient number, since it is larger than the sum of its proper divisors (533342769).

1200021201 is a wasteful number, since it uses less digits than its factorization.

1200021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133335695 (or 133335692 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1200021201 is about 34641.3221601024. The cubic root of 1200021201 is about 1062.6648273192.

Adding to 1200021201 its reverse (1021200021), we get a palindrome (2221221222).

The spelling of 1200021201 in words is "one billion, two hundred million, twenty-one thousand, two hundred one".