1003000221 has 18 divisors (see below), whose sum is σ = 1539017402. Its totient is φ = 629331840.

The previous prime is 1003000211. The next prime is 1003000223. The reversal of 1003000221 is 1220003001.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 655923321 + 347076900 = 25611^2 + 18630^2 .

It is not a de Polignac number, because 1003000221 - 2⁵ = 1003000189 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (1003000223) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 190210 + ... + 195411.

Almost surely, 2^1003000221 is an apocalyptic number.

It is an amenable number.

1003000221 is a deficient number, since it is larger than the sum of its proper divisors (536017181).

1003000221 is a wasteful number, since it uses less digits than its factorization.

1003000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385661 (or 385641 counting only the distinct ones).

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

The square root of 1003000221 is about 31670.1787333131. The cubic root of 1003000221 is about 1000.9990751830. Note that the first 3 decimals are identical.

Adding to 1003000221 its reverse (1220003001), we get a palindrome (2223003222).

The spelling of 1003000221 in words is "one billion, three million, two hundred twenty-one", and thus it is an aban number.