2002021018 has 4 divisors (see below), whose sum is σ = 3003031530. Its totient is φ = 1001010508.

The previous prime is 2002021001. The next prime is 2002021019. The reversal of 2002021018 is 8101202002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1995140889 + 6880129 = 44667^2 + 2623^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2002020992 and 2002021010.

It is not an unprimeable number, because it can be changed into a prime (2002021019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500505253 + ... + 500505256.

Almost surely, 2^2002021018 is an apocalyptic number.

2002021018 is a deficient number, since it is larger than the sum of its proper divisors (1001010512).

2002021018 is a wasteful number, since it uses less digits than its factorization.

2002021018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001010511.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 2002021018 is about 44743.9495127554. The cubic root of 2002021018 is about 1260.3452942128.

The spelling of 2002021018 in words is "two billion, two million, twenty-one thousand, eighteen".