2001122120 has 32 divisors (see below), whose sum is σ = 4505571000. Its totient is φ = 799907328.

The previous prime is 2001122117. The next prime is 2001122143. The reversal of 2001122120 is 212211002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1885817476 + 115304644 = 43426^2 + 10738^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45812 + ... + 78108.

Almost surely, 2^2001122120 is an apocalyptic number.

2001122120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001122120 is an abundant number, since it is smaller than the sum of its proper divisors (2504448880).

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

2001122120 is a wasteful number, since it uses less digits than its factorization.

2001122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33857 (or 33853 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2001122120 is about 44733.9034737636. The cubic root of 2001122120 is about 1260.1566362758.

Adding to 2001122120 its reverse (212211002), we get a palindrome (2213333122).

The spelling of 2001122120 in words is "two billion, one million, one hundred twenty-two thousand, one hundred twenty".