221223123 has 16 divisors (see below), whose sum is σ = 357532800. Its totient is φ = 134074440.

The previous prime is 221223109. The next prime is 221223127. The reversal of 221223123 is 321322122.

It is not a de Polignac number, because 221223123 - 2⁸ = 221222867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221223096 and 221223105.

It is not an unprimeable number, because it can be changed into a prime (221223127) 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, 372133 + ... + 372726.

It is an arithmetic number, because the mean of its divisors is an integer number (22345800).

Almost surely, 2^221223123 is an apocalyptic number.

221223123 is a deficient number, since it is larger than the sum of its proper divisors (136309677).

221223123 is a wasteful number, since it uses less digits than its factorization.

221223123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744879 (or 744873 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 221223123 is about 14873.5712927326. The cubic root of 221223123 is about 604.7977585975.

Adding to 221223123 its reverse (321322122), we get a palindrome (542545245).

The spelling of 221223123 in words is "two hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty-three".