2001121110021 has 16 divisors (see below), whose sum is σ = 2912767165440. Its totient is φ = 1211948359920.

The previous prime is 2001121110017. The next prime is 2001121110031. The reversal of 2001121110021 is 1200111211002.

It is not a de Polignac number, because 2001121110021 - 2² = 2001121110017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001121109979 and 2001121110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001121110031) 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 15 ways as a sum of consecutive naturals, for example, 21260151 + ... + 21354068.

It is an arithmetic number, because the mean of its divisors is an integer number (182047947840).

Almost surely, 2^{2001121110021} is an apocalyptic number.

It is an amenable number.

2001121110021 is a deficient number, since it is larger than the sum of its proper divisors (911646055419).

2001121110021 is a wasteful number, since it uses less digits than its factorization.

2001121110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42615656.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2001121110021 its reverse (1200111211002), we get a palindrome (3201232321023).

The spelling of 2001121110021 in words is "two trillion, one billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".