2001002201021 has 4 divisors (see below), whose sum is σ = 2001055582944. Its totient is φ = 2000948819100.

The previous prime is 2001002200963. The next prime is 2001002201041. The reversal of 2001002201021 is 1201022001002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001002201021 - 2²⁶ = 2000935092157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2001002200993 and 2001002201011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001002201041) 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, 26634695 + ... + 26709716.

It is an arithmetic number, because the mean of its divisors is an integer number (500263895736).

Almost surely, 2^{2001002201021} is an apocalyptic number.

It is an amenable number.

2001002201021 is a deficient number, since it is larger than the sum of its proper divisors (53381923).

2001002201021 is an equidigital number, since it uses as much as digits as its factorization.

2001002201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53381922.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2001002201021 its reverse (1201022001002), we get a palindrome (3202024202023).

The spelling of 2001002201021 in words is "two trillion, one billion, two million, two hundred one thousand, twenty-one".