221432144 has 40 divisors (see below), whose sum is σ = 441721728. Its totient is φ = 107467520.

The previous prime is 221432117. The next prime is 221432149. The reversal of 221432144 is 441234122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221432149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148169 + ... + 149655.

Almost surely, 2^221432144 is an apocalyptic number.

It is an amenable number.

221432144 is a deficient number, since it is larger than the sum of its proper divisors (220289584).

221432144 is a wasteful number, since it uses less digits than its factorization.

221432144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1763 (or 1757 counting only the distinct ones).

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

The square root of 221432144 is about 14880.5962246141. The cubic root of 221432144 is about 604.9881781721.

Adding to 221432144 its reverse (441234122), we get a palindrome (662666266).

The spelling of 221432144 in words is "two hundred twenty-one million, four hundred thirty-two thousand, one hundred forty-four".