221043423 has 32 divisors (see below), whose sum is σ = 322560000. Its totient is φ = 134265600.

The previous prime is 221043421. The next prime is 221043451. The reversal of 221043423 is 324340122.

It is not a de Polignac number, because 221043423 - 2¹ = 221043421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221043423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221043421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109578 + ... + 111576.

It is an arithmetic number, because the mean of its divisors is an integer number (10080000).

Almost surely, 2^221043423 is an apocalyptic number.

221043423 is a deficient number, since it is larger than the sum of its proper divisors (101516577).

221043423 is a wasteful number, since it uses less digits than its factorization.

221043423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103.

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

The square root of 221043423 is about 14867.5291491223. The cubic root of 221043423 is about 604.6339547470.

Adding to 221043423 its reverse (324340122), we get a palindrome (545383545).

The spelling of 221043423 in words is "two hundred twenty-one million, forty-three thousand, four hundred twenty-three".