221434123 has 4 divisors (see below), whose sum is σ = 224102088. Its totient is φ = 218766160.

The previous prime is 221434099. The next prime is 221434193. The reversal of 221434123 is 321434122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321434122 = 2 ⋅160717061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221434123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221434094 and 221434103.

It is not an unprimeable number, because it can be changed into a prime (221434193) 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 3 ways as a sum of consecutive naturals, for example, 1333858 + ... + 1334023.

It is an arithmetic number, because the mean of its divisors is an integer number (56025522).

Almost surely, 2^221434123 is an apocalyptic number.

221434123 is a deficient number, since it is larger than the sum of its proper divisors (2667965).

221434123 is an equidigital number, since it uses as much as digits as its factorization.

221434123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667964.

The product of its digits is 1152, while the sum is 22.

The square root of 221434123 is about 14880.6627204570. The cubic root of 221434123 is about 604.9899804820.

Adding to 221434123 its reverse (321434122), we get a palindrome (542868245).

Subtracting 221434123 from its reverse (321434122), we obtain a palindrome (99999999).

The spelling of 221434123 in words is "two hundred twenty-one million, four hundred thirty-four thousand, one hundred twenty-three".