2221121222 has 8 divisors (see below), whose sum is σ = 3331887672. Its totient is φ = 1110492000.

The previous prime is 2221121173. The next prime is 2221121239. The reversal of 2221121222 is 2221211222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 2221121222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31097 + ... + 73547.

It is an arithmetic number, because the mean of its divisors is an integer number (416485959).

Almost surely, 2^2221121222 is an apocalyptic number.

2221121222 is a deficient number, since it is larger than the sum of its proper divisors (1110766450).

2221121222 is a wasteful number, since it uses less digits than its factorization.

2221121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68614.

The product of its digits is 128, while the sum is 17.

The square root of 2221121222 is about 47128.7727614458. The cubic root of 2221121222 is about 1304.7403312806.

Adding to 2221121222 its reverse (2221211222), we get a palindrome (4442332444).

Subtracting 2221121222 from its reverse (2221211222), we obtain a square (90000 = 300²).

The spelling of 2221121222 in words is "two billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".