1001220003 has 12 divisors (see below), whose sum is σ = 1652807728. Its totient is φ = 572125680.

The previous prime is 1001220001. The next prime is 1001220013. The reversal of 1001220003 is 3000221001.

It is a happy number.

It is not a de Polignac number, because 1001220003 - 2¹ = 1001220001 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 not an unprimeable number, because it can be changed into a prime (1001220001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7946128 + ... + 7946253.

Almost surely, 2^1001220003 is an apocalyptic number.

1001220003 is a deficient number, since it is larger than the sum of its proper divisors (651587725).

1001220003 is a wasteful number, since it uses less digits than its factorization.

1001220003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15892394 (or 15892391 counting only the distinct ones).

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

The square root of 1001220003 is about 31642.0606629846. The cubic root of 1001220003 is about 1000.4065024001.

Adding to 1001220003 its reverse (3000221001), we get a palindrome (4001441004).

The spelling of 1001220003 in words is "one billion, one million, two hundred twenty thousand, three".