221423144 has 16 divisors (see below), whose sum is σ = 415991700. Its totient is φ = 110492032.

The previous prime is 221423123. The next prime is 221423171. The reversal of 221423144 is 441324122.

It can be written as a sum of positive squares in 2 ways, for example, as 192155044 + 29268100 = 13862^2 + 5410^2 .

It is a plaindrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23117 + ... + 31260.

Almost surely, 2^221423144 is an apocalyptic number.

It is an amenable number.

221423144 is a deficient number, since it is larger than the sum of its proper divisors (194568556).

221423144 is a wasteful number, since it uses less digits than its factorization.

221423144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54892 (or 54888 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 221423144 is about 14880.2938143035. The cubic root of 221423144 is about 604.9799815793.

Adding to 221423144 its reverse (441324122), we get a palindrome (662747266).

The spelling of 221423144 in words is "two hundred twenty-one million, four hundred twenty-three thousand, one hundred forty-four".