221120224 has 48 divisors (see below), whose sum is σ = 496410768. Its totient is φ = 96049152.

The previous prime is 221120219. The next prime is 221120231. The reversal of 221120224 is 422021122.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 221120198 and 221120207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8562 + ... + 22705.

It is an arithmetic number, because the mean of its divisors is an integer number (10341891).

Almost surely, 2^221120224 is an apocalyptic number.

It is an amenable number.

221120224 is an abundant number, since it is smaller than the sum of its proper divisors (275290544).

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

221120224 is a wasteful number, since it uses less digits than its factorization.

221120224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31307 (or 31299 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221120224 is about 14870.1117682417. Note that the first 3 decimals coincide. The cubic root of 221120224 is about 604.7039728377.

Adding to 221120224 its reverse (422021122), we get a palindrome (643141346).

The spelling of 221120224 in words is "two hundred twenty-one million, one hundred twenty thousand, two hundred twenty-four".