221423224 has 48 divisors (see below), whose sum is σ = 464196600. Its totient is φ = 98915520.

The previous prime is 221423203. The next prime is 221423243. The reversal of 221423224 is 422324122.

221423224 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 221423195 and 221423204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55174 + ... + 59050.

Almost surely, 2^221423224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221423224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232098300).

221423224 is an abundant number, since it is smaller than the sum of its proper divisors (242773376).

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

221423224 is a wasteful number, since it uses less digits than its factorization.

221423224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964 (or 3949 counting only the distinct ones).

The product of its digits is 1536, while the sum is 22.

The square root of 221423224 is about 14880.2965024223. The cubic root of 221423224 is about 604.9800544389.

Adding to 221423224 its reverse (422324122), we get a palindrome (643747346).

The spelling of 221423224 in words is "two hundred twenty-one million, four hundred twenty-three thousand, two hundred twenty-four".