2002002021 has 16 divisors (see below), whose sum is σ = 2966627520. Its totient is φ = 1334353680.

The previous prime is 2002002017. The next prime is 2002002029. The reversal of 2002002021 is 1202002002.

It is not a de Polignac number, because 2002002021 - 2² = 2002002017 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 2002001994 and 2002002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002002029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191551 + ... + 201731.

It is an arithmetic number, because the mean of its divisors is an integer number (185414220).

Almost surely, 2^2002002021 is an apocalyptic number.

It is an amenable number.

2002002021 is a deficient number, since it is larger than the sum of its proper divisors (964625499).

2002002021 is a wasteful number, since it uses less digits than its factorization.

2002002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17473 (or 17467 counting only the distinct ones).

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

The square root of 2002002021 is about 44743.7372265661. The cubic root of 2002002021 is about 1260.3413077652.

Adding to 2002002021 its reverse (1202002002), we get a palindrome (3204004023).

The spelling of 2002002021 in words is "two billion, two million, two thousand, twenty-one".