221044140 has 60 divisors (see below), whose sum is σ = 693428736. Its totient is φ = 58944672.

The previous prime is 221044139. The next prime is 221044151. The reversal of 221044140 is 41440122.

221044140 is a `hidden beast` number, since 221 + 0 + 441 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66604 + ... + 69843.

Almost surely, 2^221044140 is an apocalyptic number.

221044140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221044140 is an abundant number, since it is smaller than the sum of its proper divisors (472384596).

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

221044140 is a wasteful number, since it uses less digits than its factorization.

221044140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136468 (or 136457 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 221044140 is about 14867.5532620536. The cubic root of 221044140 is about 604.6346084980.

Adding to 221044140 its reverse (41440122), we get a palindrome (262484262).

It can be divided in two parts, 22104 and 4140, that added together give a square (26244 = 162²).

The spelling of 221044140 in words is "two hundred twenty-one million, forty-four thousand, one hundred forty".