221331123 has 20 divisors (see below), whose sum is σ = 356065248. Its totient is φ = 136203120.

The previous prime is 221331107. The next prime is 221331137. The reversal of 221331123 is 321133122.

It is not a de Polignac number, because 221331123 - 2⁴ = 221331107 is a prime.

It is a super-2 number, since 2×221331123² = 97974932016882258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221331096 and 221331105.

It is not an unprimeable number, because it can be changed into a prime (221331623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 104043 + ... + 106148.

Almost surely, 2^221331123 is an apocalyptic number.

221331123 is a deficient number, since it is larger than the sum of its proper divisors (134734125).

221331123 is a wasteful number, since it uses less digits than its factorization.

221331123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210216 (or 210207 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 221331123 is about 14877.2014505417. The cubic root of 221331123 is about 604.8961623125.

Adding to 221331123 its reverse (321133122), we get a palindrome (542464245).

The spelling of 221331123 in words is "two hundred twenty-one million, three hundred thirty-one thousand, one hundred twenty-three".