221340423 has 4 divisors (see below), whose sum is σ = 295120568. Its totient is φ = 147560280.

The previous prime is 221340409. The next prime is 221340439. The reversal of 221340423 is 324043122.

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

It is not a de Polignac number, because 221340423 - 2⁶ = 221340359 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 221340423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221341423) 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, 36890068 + ... + 36890073.

It is an arithmetic number, because the mean of its divisors is an integer number (73780142).

Almost surely, 2^221340423 is an apocalyptic number.

221340423 is a deficient number, since it is larger than the sum of its proper divisors (73780145).

221340423 is an equidigital number, since it uses as much as digits as its factorization.

221340423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73780144.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 221340423 is about 14877.5140060428. The cubic root of 221340423 is about 604.9046344687.

Adding to 221340423 its reverse (324043122), we get a palindrome (545383545).

The spelling of 221340423 in words is "two hundred twenty-one million, three hundred forty thousand, four hundred twenty-three".