221540222 has 16 divisors (see below), whose sum is σ = 344701440. Its totient is φ = 106660512.

The previous prime is 221540219. The next prime is 221540269. The reversal of 221540222 is 222045122.

221540222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221540194 and 221540203.

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, 17228 + ... + 27200.

It is an arithmetic number, because the mean of its divisors is an integer number (21543840).

Almost surely, 2^221540222 is an apocalyptic number.

221540222 is a deficient number, since it is larger than the sum of its proper divisors (123161218).

221540222 is a wasteful number, since it uses less digits than its factorization.

221540222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10387.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 221540222 is about 14884.2272893154. The cubic root of 221540222 is about 605.0865909801.

Adding to 221540222 its reverse (222045122), we get a palindrome (443585344).

The spelling of 221540222 in words is "two hundred twenty-one million, five hundred forty thousand, two hundred twenty-two".