221311123 has 8 divisors (see below), whose sum is σ = 241680816. Its totient is φ = 200983200.

The previous prime is 221311121. The next prime is 221311147. The reversal of 221311123 is 321113122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221311123 - 2¹ = 221311121 is a prime.

It is a super-2 number, since 2×221311123² = 97957226327042258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221311097 and 221311106.

It is not an unprimeable number, because it can be changed into a prime (221311121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1213 + ... + 21073.

It is an arithmetic number, because the mean of its divisors is an integer number (30210102).

Almost surely, 2^221311123 is an apocalyptic number.

221311123 is a deficient number, since it is larger than the sum of its proper divisors (20369693).

221311123 is a wasteful number, since it uses less digits than its factorization.

221311123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20885.

The product of its digits is 72, while the sum is 16.

The square root of 221311123 is about 14876.5292659276. The cubic root of 221311123 is about 604.8779418178.

Adding to 221311123 its reverse (321113122), we get a palindrome (542424245).

The spelling of 221311123 in words is "two hundred twenty-one million, three hundred eleven thousand, one hundred twenty-three".