2002001021 has 2 divisors, whose sum is σ = 2002001022. Its totient is φ = 2002001020.

The previous prime is 2002000969. The next prime is 2002001033. The reversal of 2002001021 is 1201002002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1444380025 + 557620996 = 38005^2 + 23614^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002001021 - 2¹⁰ = 2001999997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2002004021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001000510 + 1001000511.

It is an arithmetic number, because the mean of its divisors is an integer number (1001000511).

Almost surely, 2^2002001021 is an apocalyptic number.

It is an amenable number.

2002001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002001021 is an equidigital number, since it uses as much as digits as its factorization.

2002001021 is an evil number, because the sum of its binary digits is even.

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

The square root of 2002001021 is about 44743.7260518165. The cubic root of 2002001021 is about 1260.3410979184.

Adding to 2002001021 its reverse (1201002002), we get a palindrome (3203003023).

The spelling of 2002001021 in words is "two billion, two million, one thousand, twenty-one".