2001121122 has 64 divisors (see below), whose sum is σ = 5373656064. Its totient is φ = 479787840.

The previous prime is 2001121117. The next prime is 2001121139. The reversal of 2001121122 is 2211211002.

It is a junction number, because it is equal to n+sod(n) for n = 2001121098 and 2001121107.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160588 + ... + 172599.

It is an arithmetic number, because the mean of its divisors is an integer number (83963376).

Almost surely, 2^2001121122 is an apocalyptic number.

2001121122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2001121122 is an abundant number, since it is smaller than the sum of its proper divisors (3372534942).

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

2001121122 is a wasteful number, since it uses less digits than its factorization.

2001121122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333223.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2001121122 is about 44733.8923189118. The cubic root of 2001121122 is about 1260.1564267872.

Adding to 2001121122 its reverse (2211211002), we get a palindrome (4212332124).

The spelling of 2001121122 in words is "two billion, one million, one hundred twenty-one thousand, one hundred twenty-two".