2001120211021 has 4 divisors (see below), whose sum is σ = 2033925460444. Its totient is φ = 1968314961600.

The previous prime is 2001120210983. The next prime is 2001120211031. The reversal of 2001120211021 is 1201120211002.

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 345044634025 + 1656075576996 = 587405^2 + 1286886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001120211021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001120210992 and 2001120211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001120211031) 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, 16402624620 + ... + 16402624741.

It is an arithmetic number, because the mean of its divisors is an integer number (508481365111).

Almost surely, 2^{2001120211021} is an apocalyptic number.

It is an amenable number.

2001120211021 is a deficient number, since it is larger than the sum of its proper divisors (32805249423).

2001120211021 is an equidigital number, since it uses as much as digits as its factorization.

2001120211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32805249422.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2001120211021 its reverse (1201120211002), we get a palindrome (3202240422023).

The spelling of 2001120211021 in words is "two trillion, one billion, one hundred twenty million, two hundred eleven thousand, twenty-one".