2001211121012 has 48 divisors (see below), whose sum is σ = 3839819655168. Its totient is φ = 908492213760.

The previous prime is 2001211121009. The next prime is 2001211121023. The reversal of 2001211121012 is 2101211121002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 829148 + ... + 2165619.

It is an arithmetic number, because the mean of its divisors is an integer number (79996242816).

Almost surely, 2^{2001211121012} is an apocalyptic number.

It is an amenable number.

2001211121012 is a deficient number, since it is larger than the sum of its proper divisors (1838608534156).

2001211121012 is a wasteful number, since it uses less digits than its factorization.

2001211121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995136 (or 2995134 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2001211121012 its reverse (2101211121002), we get a palindrome (4102422242014).

The spelling of 2001211121012 in words is "two trillion, one billion, two hundred eleven million, one hundred twenty-one thousand, twelve".