2001122222 has 32 divisors (see below), whose sum is σ = 3452246784. Its totient is φ = 861062400.

The previous prime is 2001122143. The next prime is 2001122251. The reversal of 2001122222 is 2222211002.

It is a junction number, because it is equal to n+sod(n) for n = 2001122197 and 2001122206.

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 15 ways as a sum of consecutive naturals, for example, 28697 + ... + 69467.

It is an arithmetic number, because the mean of its divisors is an integer number (107882712).

Almost surely, 2^2001122222 is an apocalyptic number.

2001122222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2001122222 is a deficient number, since it is larger than the sum of its proper divisors (1451124562).

2001122222 is a wasteful number, since it uses less digits than its factorization.

2001122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40904.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2001122222 is about 44733.9046138385. The cubic root of 2001122222 is about 1260.1566576864.

Adding to 2001122222 its reverse (2222211002), we get a palindrome (4223333224).

The spelling of 2001122222 in words is "two billion, one million, one hundred twenty-two thousand, two hundred twenty-two".