2001222120222 has 128 divisors (see below), whose sum is σ = 4956481152000. Its totient is φ = 594277326720.

The previous prime is 2001222120221. The next prime is 2001222120239. The reversal of 2001222120222 is 2220212221002.

2001222120222 is a `hidden beast` number, since 200 + 1 + 2 + 221 + 20 + 222 = 666.

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 = 2001222120195 and 2001222120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001222120221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51506679 + ... + 51545517.

It is an arithmetic number, because the mean of its divisors is an integer number (38722509000).

Almost surely, 2^{2001222120222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001222120222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2478240576000).

2001222120222 is an abundant number, since it is smaller than the sum of its proper divisors (2955259031778).

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

2001222120222 is a wasteful number, since it uses less digits than its factorization.

2001222120222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41423 (or 41417 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 2001222120222 its reverse (2220212221002), we get a palindrome (4221434341224).

The spelling of 2001222120222 in words is "two trillion, one billion, two hundred twenty-two million, one hundred twenty thousand, two hundred twenty-two".