1155021201 has 20 divisors (see below), whose sum is σ = 1731533232. Its totient is φ = 767278008.

The previous prime is 1155021187. The next prime is 1155021221. The reversal of 1155021201 is 1021205511.

It is not a de Polignac number, because 1155021201 - 2⁵ = 1155021169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2271 + ... + 48116.

Almost surely, 2^1155021201 is an apocalyptic number.

It is an amenable number.

1155021201 is a deficient number, since it is larger than the sum of its proper divisors (576512031).

1155021201 is an equidigital number, since it uses as much as digits as its factorization.

1155021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50682 (or 50673 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1155021201 is about 33985.6028488535. The cubic root of 1155021201 is about 1049.2121682087.

Adding to 1155021201 its reverse (1021205511), we get a palindrome (2176226712).

The spelling of 1155021201 in words is "one billion, one hundred fifty-five million, twenty-one thousand, two hundred one".