2011121220 has 48 divisors (see below), whose sum is σ = 5637421440. Its totient is φ = 535700736.

The previous prime is 2011121201. The next prime is 2011121269. The reversal of 2011121220 is 221211102.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2011121196 and 2011121205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36904 + ... + 73376.

It is an arithmetic number, because the mean of its divisors is an integer number (117446280).

Almost surely, 2^2011121220 is an apocalyptic number.

2011121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011121220 is an abundant number, since it is smaller than the sum of its proper divisors (3626300220).

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

2011121220 is a wasteful number, since it uses less digits than its factorization.

2011121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37404 (or 37402 counting only the distinct ones).

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

The square root of 2011121220 is about 44845.5261982731. The cubic root of 2011121220 is about 1262.2520444981.

Adding to 2011121220 its reverse (221211102), we get a palindrome (2232332322).

The spelling of 2011121220 in words is "two billion, eleven million, one hundred twenty-one thousand, two hundred twenty".