221143664 has 30 divisors (see below), whose sum is σ = 498421224. Its totient is φ = 94775520.

The previous prime is 221143661. The next prime is 221143693. The reversal of 221143664 is 466341122.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221143661) 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 5 ways as a sum of consecutive naturals, for example, 140252 + ... + 141819.

Almost surely, 2^221143664 is an apocalyptic number.

It is an amenable number.

221143664 is an abundant number, since it is smaller than the sum of its proper divisors (277277560).

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

221143664 is a wasteful number, since it uses less digits than its factorization.

221143664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282093 (or 282080 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 221143664 is about 14870.8999055202. The cubic root of 221143664 is about 604.7253394349.

Adding to 221143664 its reverse (466341122), we get a palindrome (687484786).

The spelling of 221143664 in words is "two hundred twenty-one million, one hundred forty-three thousand, six hundred sixty-four".