221423444 has 24 divisors (see below), whose sum is σ = 423487008. Its totient is φ = 100463840.

The previous prime is 221423431. The next prime is 221423459. The reversal of 221423444 is 444324122.

It is a happy number.

221423444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221423444² = 98056683105642272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21542 + ... + 30114.

It is an arithmetic number, because the mean of its divisors is an integer number (17645292).

Almost surely, 2^221423444 is an apocalyptic number.

It is an amenable number.

221423444 is a deficient number, since it is larger than the sum of its proper divisors (202063564).

221423444 is a wasteful number, since it uses less digits than its factorization.

221423444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9175 (or 9173 counting only the distinct ones).

The product of its digits is 6144, while the sum is 26.

The square root of 221423444 is about 14880.3038947462. The cubic root of 221423444 is about 604.9802548026.

Adding to 221423444 its reverse (444324122), we get a palindrome (665747566).

The spelling of 221423444 in words is "two hundred twenty-one million, four hundred twenty-three thousand, four hundred forty-four".