2001121011121 has 4 divisors (see below), whose sum is σ = 2001143778292. Its totient is φ = 2001098243952.

The previous prime is 2001121011091. The next prime is 2001121011179. The reversal of 2001121011121 is 1211101211002.

It is a happy number.

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 435156592896 + 1565964418225 = 659664^2 + 1251385^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001121011121 - 2⁵ = 2001121011089 is a prime.

It is a super-2 number, since 2×2001121011121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001121011821) 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, 11251230 + ... + 11427703.

It is an arithmetic number, because the mean of its divisors is an integer number (500285944573).

Almost surely, 2^{2001121011121} is an apocalyptic number.

It is an amenable number.

2001121011121 is a deficient number, since it is larger than the sum of its proper divisors (22767171).

2001121011121 is an equidigital number, since it uses as much as digits as its factorization.

2001121011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22767170.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 2001121011121 its reverse (1211101211002), we get a palindrome (3212222222123).

The spelling of 2001121011121 in words is "two trillion, one billion, one hundred twenty-one million, eleven thousand, one hundred twenty-one".