2001220201121 has 2 divisors, whose sum is σ = 2001220201122. Its totient is φ = 2001220201120.

The previous prime is 2001220201117. The next prime is 2001220201151. The reversal of 2001220201121 is 1211020221002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1372093620496 + 629126580625 = 1171364^2 + 793175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001220201121 - 2² = 2001220201117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001220201096 and 2001220201105.

It is not a weakly prime, because it can be changed into another prime (2001220201151) 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 as a sum of consecutive naturals, namely, 1000610100560 + 1000610100561.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610100561).

Almost surely, 2^{2001220201121} is an apocalyptic number.

It is an amenable number.

2001220201121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001220201121 is an equidigital number, since it uses as much as digits as its factorization.

2001220201121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001220201121 its reverse (1211020221002), we get a palindrome (3212240422123).

The spelling of 2001220201121 in words is "two trillion, one billion, two hundred twenty million, two hundred one thousand, one hundred twenty-one".