1003020021 has 12 divisors (see below), whose sum is σ = 1482500448. Its totient is φ = 653129064.

The previous prime is 1003020019. The next prime is 1003020059. The reversal of 1003020021 is 1200203001.

It is a happy number.

It is not a de Polignac number, because 1003020021 - 2¹ = 1003020019 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1003019985 and 1003020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003020521) 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, 1295505 + ... + 1296278.

It is an arithmetic number, because the mean of its divisors is an integer number (123541704).

Almost surely, 2^1003020021 is an apocalyptic number.

It is an amenable number.

1003020021 is a deficient number, since it is larger than the sum of its proper divisors (479480427).

1003020021 is a wasteful number, since it uses less digits than its factorization.

1003020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591832 (or 2591829 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1003020021 is about 31670.4913286801. The cubic root of 1003020021 is about 1001.0056619716.

Adding to 1003020021 its reverse (1200203001), we get a palindrome (2203223022).

The spelling of 1003020021 in words is "one billion, three million, twenty thousand, twenty-one".