221144440 has 48 divisors (see below), whose sum is σ = 546933240. Its totient is φ = 80414400.

The previous prime is 221144437. The next prime is 221144479. The reversal of 221144440 is 44441122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18006 + ... + 27685.

Almost surely, 2^221144440 is an apocalyptic number.

221144440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221144440 is an abundant number, since it is smaller than the sum of its proper divisors (325788800).

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

221144440 is a wasteful number, since it uses less digits than its factorization.

221144440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45724 (or 45709 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 221144440 is about 14870.9259967226. The cubic root of 221144440 is about 604.7260467674.

Adding to 221144440 its reverse (44441122), we get a palindrome (265585562).

The spelling of 221144440 in words is "two hundred twenty-one million, one hundred forty-four thousand, four hundred forty".