2002011021 has 12 divisors (see below), whose sum is σ = 2896177180. Its totient is φ = 1332650880.

The previous prime is 2002011007. The next prime is 2002011041. The reversal of 2002011021 is 1201102002.

It can be written as a sum of positive squares in 2 ways, for example, as 1780418025 + 221592996 = 42195^2 + 14886^2 .

It is not a de Polignac number, because 2002011021 - 2²³ = 1993622413 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002010994 and 2002011012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002011041) 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, 162316 + ... + 174213.

Almost surely, 2^2002011021 is an apocalyptic number.

It is an amenable number.

2002011021 is a deficient number, since it is larger than the sum of its proper divisors (894166159).

2002011021 is a wasteful number, since it uses less digits than its factorization.

2002011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337196 (or 337193 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2002011021 is about 44743.8377991875. The cubic root of 2002011021 is about 1260.3431963838.

Adding to 2002011021 its reverse (1201102002), we get a palindrome (3203113023).

The spelling of 2002011021 in words is "two billion, two million, eleven thousand, twenty-one".