2001220012121 has 32 divisors (see below), whose sum is σ = 2308080614400. Its totient is φ = 1716024502080.

The previous prime is 2001220012111. The next prime is 2001220012123. The reversal of 2001220012121 is 1212100221002.

It is a cyclic number.

It is not a de Polignac number, because 2001220012121 - 2¹⁰ = 2001220011097 is a prime.

It is a super-3 number, since 3×2001220012121³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001220012096 and 2001220012105.

It is not an unprimeable number, because it can be changed into a prime (2001220012123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108770495 + ... + 108788891.

It is an arithmetic number, because the mean of its divisors is an integer number (72127519200).

Almost surely, 2^{2001220012121} is an apocalyptic number.

It is an amenable number.

2001220012121 is a deficient number, since it is larger than the sum of its proper divisors (306860602279).

2001220012121 is a wasteful number, since it uses less digits than its factorization.

2001220012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20669.

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

Adding to 2001220012121 its reverse (1212100221002), we get a palindrome (3213320233123).

The spelling of 2001220012121 in words is "two trillion, one billion, two hundred twenty million, twelve thousand, one hundred twenty-one".