2002013021 has 4 divisors (see below), whose sum is σ = 2015449500. Its totient is φ = 1988576544.

The previous prime is 2002013017. The next prime is 2002013029. The reversal of 2002013021 is 1203102002.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1177519225 + 824493796 = 34315^2 + 28714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002013021 - 2² = 2002013017 is a prime.

It is a super-2 number, since 2×2002013021² = 8016112272507092882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002012993 and 2002013011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002013029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6718016 + ... + 6718313.

It is an arithmetic number, because the mean of its divisors is an integer number (503862375).

Almost surely, 2^2002013021 is an apocalyptic number.

It is an amenable number.

2002013021 is a deficient number, since it is larger than the sum of its proper divisors (13436479).

2002013021 is a wasteful number, since it uses less digits than its factorization.

2002013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13436478.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2002013021 is about 44743.8601486282. The cubic root of 2002013021 is about 1260.3436160761.

Adding to 2002013021 its reverse (1203102002), we get a palindrome (3205115023).

The spelling of 2002013021 in words is "two billion, two million, thirteen thousand, twenty-one".