1001221220222 has 8 divisors (see below), whose sum is σ = 1501878819096. Its totient is φ = 500594947192.

The previous prime is 1001221220123. The next prime is 1001221220231. The reversal of 1001221220222 is 2220221221001.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1001221220222.

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, 7751393 + ... + 7879500.

It is an arithmetic number, because the mean of its divisors is an integer number (187734852387).

Almost surely, 2^{1001221220222} is an apocalyptic number.

1001221220222 is a deficient number, since it is larger than the sum of its proper divisors (500657598874).

1001221220222 is a wasteful number, since it uses less digits than its factorization.

1001221220222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15662922.

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

Adding to 1001221220222 its reverse (2220221221001), we get a palindrome (3221442441223).

The spelling of 1001221220222 in words is "one trillion, one billion, two hundred twenty-one million, two hundred twenty thousand, two hundred twenty-two".