2002000021 has 8 divisors (see below), whose sum is σ = 2292702080. Its totient is φ = 1712473488.

The previous prime is 2001999997. The next prime is 2002000027. The reversal of 2002000021 is 1200002002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2002000021 - 2²⁹ = 1465129109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001999968 and 2002000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002000027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290226 + ... + 297043.

It is an arithmetic number, because the mean of its divisors is an integer number (286587760).

Almost surely, 2^2002000021 is an apocalyptic number.

It is an amenable number.

2002000021 is a deficient number, since it is larger than the sum of its proper divisors (290702059).

2002000021 is an equidigital number, since it uses as much as digits as its factorization.

2002000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587763.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 2002000021 is about 44743.7148770640. The cubic root of 2002000021 is about 1260.3408880715.

Adding to 2002000021 its reverse (1200002002), we get a palindrome (3202002023).

The spelling of 2002000021 in words is "two billion, two million, twenty-one", and thus it is an aban number and an uban number.