221124143 has 4 divisors (see below), whose sum is σ = 225828960. Its totient is φ = 216419328.

The previous prime is 221124133. The next prime is 221124157. The reversal of 221124143 is 341421122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221124143 - 2⁸ = 221123887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221124133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2352338 + ... + 2352431.

It is an arithmetic number, because the mean of its divisors is an integer number (56457240).

Almost surely, 2^221124143 is an apocalyptic number.

221124143 is a deficient number, since it is larger than the sum of its proper divisors (4704817).

221124143 is an equidigital number, since it uses as much as digits as its factorization.

221124143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4704816.

The product of its digits is 384, while the sum is 20.

The square root of 221124143 is about 14870.2435420540. The cubic root of 221124143 is about 604.7075452847.

Adding to 221124143 its reverse (341421122), we get a palindrome (562545265).

The spelling of 221124143 in words is "two hundred twenty-one million, one hundred twenty-four thousand, one hundred forty-three".