221132444 has 24 divisors (see below), whose sum is σ = 419232240. Its totient is φ = 102057072.

The previous prime is 221132441. The next prime is 221132467. The reversal of 221132444 is 444231122.

It is a hoax number, since the sum of its digits (23) 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 (221132441) 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, 3794 + ... + 21369.

It is an arithmetic number, because the mean of its divisors is an integer number (17468010).

Almost surely, 2^221132444 is an apocalyptic number.

It is an amenable number.

221132444 is a deficient number, since it is larger than the sum of its proper divisors (198099796).

221132444 is a wasteful number, since it uses less digits than its factorization.

221132444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25206 (or 25178 counting only the distinct ones).

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

The square root of 221132444 is about 14870.5226538949. The cubic root of 221132444 is about 604.7151120968.

Adding to 221132444 its reverse (444231122), we get a palindrome (665363566).

The spelling of 221132444 in words is "two hundred twenty-one million, one hundred thirty-two thousand, four hundred forty-four".