221343123 has 8 divisors (see below), whose sum is σ = 296608000. Its totient is φ = 146820168.

The previous prime is 221343113. The next prime is 221343127. The reversal of 221343123 is 321343122.

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

It is not a de Polignac number, because 221343123 - 2⁴ = 221343107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221343123.

It is not an unprimeable number, because it can be changed into a prime (221343127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184783 + ... + 185976.

It is an arithmetic number, because the mean of its divisors is an integer number (37076000).

Almost surely, 2^221343123 is an apocalyptic number.

221343123 is a deficient number, since it is larger than the sum of its proper divisors (75264877).

221343123 is a wasteful number, since it uses less digits than its factorization.

221343123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370961.

The product of its digits is 864, while the sum is 21.

The square root of 221343123 is about 14877.6047467326. The cubic root of 221343123 is about 604.9070940825.

Adding to 221343123 its reverse (321343122), we get a palindrome (542686245).

Subtracting 221343123 from its reverse (321343122), we obtain a palindrome (99999999).

The spelling of 221343123 in words is "two hundred twenty-one million, three hundred forty-three thousand, one hundred twenty-three".