1001122212222 has 24 divisors (see below), whose sum is σ = 2366288865720. Its totient is φ = 303370367280.

The previous prime is 1001122212221. The next prime is 1001122212227. The reversal of 1001122212222 is 2222122211001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1001122212195 and 1001122212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001122212221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2528086197 + ... + 2528086592.

It is an arithmetic number, because the mean of its divisors is an integer number (98595369405).

Almost surely, 2^{1001122212222} is an apocalyptic number.

1001122212222 is an abundant number, since it is smaller than the sum of its proper divisors (1365166653498).

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

1001122212222 is a wasteful number, since it uses less digits than its factorization.

1001122212222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5056172808 (or 5056172805 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1001122212222 its reverse (2222122211001), we get a palindrome (3223244423223).

The spelling of 1001122212222 in words is "one trillion, one billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-two".