221003123 has 16 divisors (see below), whose sum is σ = 249492480. Its totient is φ = 193946400.

The previous prime is 221003093. The next prime is 221003129. The reversal of 221003123 is 321300122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221003123 - 2²⁰ = 219954547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221003098 and 221003107.

It is not an unprimeable number, because it can be changed into a prime (221003129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251561 + ... + 252437.

It is an arithmetic number, because the mean of its divisors is an integer number (15593280).

Almost surely, 2^221003123 is an apocalyptic number.

221003123 is a deficient number, since it is larger than the sum of its proper divisors (28489357).

221003123 is a wasteful number, since it uses less digits than its factorization.

221003123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 221003123 is about 14866.1737848042. The cubic root of 221003123 is about 604.5972074735.

Adding to 221003123 its reverse (321300122), we get a palindrome (542303245).

The spelling of 221003123 in words is "two hundred twenty-one million, three thousand, one hundred twenty-three".