2001221022222 has 12 divisors (see below), whose sum is σ = 4335978881520. Its totient is φ = 667073674068.

The previous prime is 2001221022211. The next prime is 2001221022277. The reversal of 2001221022222 is 2222201221002.

2001221022222 is a `hidden beast` number, since 200 + 1 + 221 + 0 + 22 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 111178945679 = 2001221022222 / (2 + 0 + 0 + 1 + 2 + 2 + 1 + 0 + 2 + 2 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 2001221022195 and 2001221022204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55589472822 + ... + 55589472857.

It is an arithmetic number, because the mean of its divisors is an integer number (361331573460).

Almost surely, 2^{2001221022222} is an apocalyptic number.

2001221022222 is an abundant number, since it is smaller than the sum of its proper divisors (2334757859298).

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

2001221022222 is a wasteful number, since it uses less digits than its factorization.

2001221022222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111178945687 (or 111178945684 counting only the distinct ones).

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

Adding to 2001221022222 its reverse (2222201221002), we get a palindrome (4223422243224).

The spelling of 2001221022222 in words is "two trillion, one billion, two hundred twenty-one million, twenty-two thousand, two hundred twenty-two".