221042323 has 4 divisors (see below), whose sum is σ = 221153400. Its totient is φ = 220931248.

The previous prime is 221042309. The next prime is 221042377. The reversal of 221042323 is 323240122.

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 221042323 - 2²¹ = 218945171 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 221042323.

It is not an unprimeable number, because it can be changed into a prime (221042023) 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, 52498 + ... + 56551.

It is an arithmetic number, because the mean of its divisors is an integer number (55288350).

Almost surely, 2^221042323 is an apocalyptic number.

221042323 is a deficient number, since it is larger than the sum of its proper divisors (111077).

221042323 is a wasteful number, since it uses less digits than its factorization.

221042323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111076.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 221042323 is about 14867.4921557067. The cubic root of 221042323 is about 604.6329517790.

Adding to 221042323 its reverse (323240122), we get a palindrome (544282445).

The spelling of 221042323 in words is "two hundred twenty-one million, forty-two thousand, three hundred twenty-three".