2001220111201 has 4 divisors (see below), whose sum is σ = 2001556287172. Its totient is φ = 2000883935232.

The previous prime is 2001220111171. The next prime is 2001220111277. The reversal of 2001220111201 is 1021110221002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 525043710801 + 1476176400400 = 724599^2 + 1214980^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001220111201 - 2²¹ = 2001218014049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001220511201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168079056 + ... + 168090961.

It is an arithmetic number, because the mean of its divisors is an integer number (500389071793).

Almost surely, 2^{2001220111201} is an apocalyptic number.

It is an amenable number.

2001220111201 is a deficient number, since it is larger than the sum of its proper divisors (336175971).

2001220111201 is an equidigital number, since it uses as much as digits as its factorization.

2001220111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336175970.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2001220111201 its reverse (1021110221002), we get a palindrome (3022330332203).

The spelling of 2001220111201 in words is "two trillion, one billion, two hundred twenty million, one hundred eleven thousand, two hundred one".