221423000 has 64 divisors (see below), whose sum is σ = 521445600. Its totient is φ = 88003200.

The previous prime is 221422963. The next prime is 221423009. The reversal of 221423000 is 324122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221423009) 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 15 ways as a sum of consecutive naturals, for example, 178382 + ... + 179618.

Almost surely, 2^221423000 is an apocalyptic number.

221423000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221423000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260722800).

221423000 is an abundant number, since it is smaller than the sum of its proper divisors (300022600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221423000 is a wasteful number, since it uses less digits than its factorization.

221423000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437 (or 1423 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 221423000 is about 14880.2889756886. The cubic root of 221423000 is about 604.9798504320.

Adding to 221423000 its reverse (324122), we get a palindrome (221747122).

The spelling of 221423000 in words is "two hundred twenty-one million, four hundred twenty-three thousand".