2001121021021 has 8 divisors (see below), whose sum is σ = 2049951355200. Its totient is φ = 1952291758560.

The previous prime is 2001121021007. The next prime is 2001121021087. The reversal of 2001121021021 is 1201201211002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001121021021 - 2³⁵ = 1966761282653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001121020992 and 2001121021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001121021421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4560990 + ... + 4980448.

It is an arithmetic number, because the mean of its divisors is an integer number (256243919400).

Almost surely, 2^{2001121021021} is an apocalyptic number.

It is an amenable number.

2001121021021 is a deficient number, since it is larger than the sum of its proper divisors (48830334179).

2001121021021 is a wasteful number, since it uses less digits than its factorization.

2001121021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535859.

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

Adding to 2001121021021 its reverse (1201201211002), we get a palindrome (3202322232023).

The spelling of 2001121021021 in words is "two trillion, one billion, one hundred twenty-one million, twenty-one thousand, twenty-one".