2001221112222 has 48 divisors (see below), whose sum is σ = 4339131582240. Its totient is φ = 666588900096.

The previous prime is 2001221112199. The next prime is 2001221112223. The reversal of 2001221112222 is 2222111221002.

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 = 2001221112195 and 2001221112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001221112223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243069018 + ... + 243077250.

It is an arithmetic number, because the mean of its divisors is an integer number (90398574630).

Almost surely, 2^{2001221112222} is an apocalyptic number.

2001221112222 is an abundant number, since it is smaller than the sum of its proper divisors (2337910470018).

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

2001221112222 is a wasteful number, since it uses less digits than its factorization.

2001221112222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16417 (or 16414 counting only the distinct ones).

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

Adding to 2001221112222 its reverse (2222111221002), we get a palindrome (4223332333224).

The spelling of 2001221112222 in words is "two trillion, one billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twenty-two".