201120001001 has 4 divisors (see below), whose sum is σ = 201172972932. Its totient is φ = 201067029072.

The previous prime is 201120000997. The next prime is 201120001003. The reversal of 201120001001 is 100100021102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100100021102 = 2 ⋅50050010551.

It can be written as a sum of positive squares in 2 ways, for example, as 41558899600 + 159561101401 = 203860^2 + 399451^2 .

It is a cyclic number.

It is not a de Polignac number, because 201120001001 - 2² = 201120000997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201120001001.

It is not an unprimeable number, because it can be changed into a prime (201120001003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26480270 + ... + 26487863.

It is an arithmetic number, because the mean of its divisors is an integer number (50293243233).

Almost surely, 2^201120001001 is an apocalyptic number.

It is an amenable number.

201120001001 is a deficient number, since it is larger than the sum of its proper divisors (52971931).

201120001001 is an equidigital number, since it uses as much as digits as its factorization.

201120001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52971930.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 201120001001 its reverse (100100021102), we get a palindrome (301220022103).

The spelling of 201120001001 in words is "two hundred one billion, one hundred twenty million, one thousand, one".