2002020021 has 12 divisors (see below), whose sum is σ = 2985091200. Its totient is φ = 1291625640.

The previous prime is 2002019947. The next prime is 2002020029. The reversal of 2002020021 is 1200202002.

It is not a de Polignac number, because 2002020021 - 2¹⁹ = 2001495733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2002019985 and 2002020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002020029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3587571 + ... + 3588128.

It is an arithmetic number, because the mean of its divisors is an integer number (248757600).

Almost surely, 2^2002020021 is an apocalyptic number.

It is an amenable number.

2002020021 is a deficient number, since it is larger than the sum of its proper divisors (983071179).

2002020021 is a wasteful number, since it uses less digits than its factorization.

2002020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175736 (or 7175733 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2002020021 is about 44743.9383715828. The cubic root of 2002020021 is about 1260.3450849968.

Adding to 2002020021 its reverse (1200202002), we get a palindrome (3202222023).

The spelling of 2002020021 in words is "two billion, two million, twenty thousand, twenty-one".