1003221001 has 4 divisors (see below), whose sum is σ = 1006447104. Its totient is φ = 999994900.

The previous prime is 1003220989. The next prime is 1003221013. The reversal of 1003221001 is 1001223001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1003220989) and next prime (1003221013).

It is a cyclic number.

It is not a de Polignac number, because 1003221001 - 2⁷ = 1003220873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1003221031) 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, 1612585 + ... + 1613206.

It is an arithmetic number, because the mean of its divisors is an integer number (251611776).

Almost surely, 2^1003221001 is an apocalyptic number.

It is an amenable number.

1003221001 is a deficient number, since it is larger than the sum of its proper divisors (3226103).

1003221001 is an equidigital number, since it uses as much as digits as its factorization.

1003221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3226102.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1003221001 is about 31673.6641549411. The cubic root of 1003221001 is about 1001.0725162976.

Adding to 1003221001 its reverse (1001223001), we get a palindrome (2004444002).

The spelling of 1003221001 in words is "one billion, three million, two hundred twenty-one thousand, one".