221222442 has 16 divisors (see below), whose sum is σ = 505651392. Its totient is φ = 63206400.

The previous prime is 221222437. The next prime is 221222461. The reversal of 221222442 is 244222122.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 2633559 + ... + 2633642.

It is an arithmetic number, because the mean of its divisors is an integer number (31603212).

Almost surely, 2^221222442 is an apocalyptic number.

221222442 is an abundant number, since it is smaller than the sum of its proper divisors (284428950).

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

221222442 is a wasteful number, since it uses less digits than its factorization.

221222442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5267213.

The product of its digits is 1024, while the sum is 21.

The square root of 221222442 is about 14873.5483997599. The cubic root of 221222442 is about 604.7971380058.

Adding to 221222442 its reverse (244222122), we get a palindrome (465444564).

The spelling of 221222442 in words is "two hundred twenty-one million, two hundred twenty-two thousand, four hundred forty-two".