2002021100021 has 4 divisors (see below), whose sum is σ = 2002058436000. Its totient is φ = 2001983764044.

The previous prime is 2002021099993. The next prime is 2002021100041. The reversal of 2002021100021 is 1200011202002.

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 2002021100021 - 2¹⁰ = 2002021098997 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 = 2002021099975 and 2002021100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002021100041) 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, 18587441 + ... + 18694838.

It is an arithmetic number, because the mean of its divisors is an integer number (500514609000).

Almost surely, 2^{2002021100021} is an apocalyptic number.

It is an amenable number.

2002021100021 is a deficient number, since it is larger than the sum of its proper divisors (37335979).

2002021100021 is an equidigital number, since it uses as much as digits as its factorization.

2002021100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37335978.

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

Adding to 2002021100021 its reverse (1200011202002), we get a palindrome (3202032302023).

The spelling of 2002021100021 in words is "two trillion, two billion, twenty-one million, one hundred thousand, twenty-one".