2001101020021 has 4 divisors (see below), whose sum is σ = 2070104503500. Its totient is φ = 1932097536544.

The previous prime is 2001101020003. The next prime is 2001101020033. The reversal of 2001101020021 is 1200201011002.

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 1124902056996 + 876198963025 = 1060614^2 + 936055^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001101020021 - 2³⁵ = 1966741281653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001101020081) 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, 34501741696 + ... + 34501741753.

It is an arithmetic number, because the mean of its divisors is an integer number (517526125875).

Almost surely, 2^{2001101020021} is an apocalyptic number.

It is an amenable number.

2001101020021 is a deficient number, since it is larger than the sum of its proper divisors (69003483479).

2001101020021 is an equidigital number, since it uses as much as digits as its factorization.

2001101020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69003483478.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2001101020021 its reverse (1200201011002), we get a palindrome (3201302031023).

The spelling of 2001101020021 in words is "two trillion, one billion, one hundred one million, twenty thousand, twenty-one".