221003 has 4 divisors (see below), whose sum is σ = 224688. Its totient is φ = 217320.

The previous prime is 220973. The next prime is 221021. The reversal of 221003 is 300122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 300122 = 2 ⋅150061.

It is a cyclic number.

It is not a de Polignac number, because 221003 - 2⁶ = 220939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221083) 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, 1751 + ... + 1872.

It is an arithmetic number, because the mean of its divisors is an integer number (56172).

2²²¹⁰⁰³ is an apocalyptic number.

221003 is a deficient number, since it is larger than the sum of its proper divisors (3685).

221003 is an equidigital number, since it uses as much as digits as its factorization.

221003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3684.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 221003 is about 470.1095616981. The cubic root of 221003 is about 60.4597095310.

Adding to 221003 its reverse (300122), we get a palindrome (521125).

The spelling of 221003 in words is "two hundred twenty-one thousand, three", and thus it is an iban number.