2011421220 has 96 divisors (see below), whose sum is σ = 5688144000. Its totient is φ = 531062784.

The previous prime is 2011421207. The next prime is 2011421227. The reversal of 2011421220 is 221241102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 2011421220.

It is not an unprimeable number, because it can be changed into a prime (2011421227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4479556 + ... + 4480004.

It is an arithmetic number, because the mean of its divisors is an integer number (59251500).

Almost surely, 2^2011421220 is an apocalyptic number.

2011421220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011421220 is an abundant number, since it is smaller than the sum of its proper divisors (3676722780).

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

2011421220 is a wasteful number, since it uses less digits than its factorization.

2011421220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2011421220 is about 44848.8708887972. The cubic root of 2011421220 is about 1262.3148049759.

Adding to 2011421220 its reverse (221241102), we get a palindrome (2232662322).

The spelling of 2011421220 in words is "two billion, eleven million, four hundred twenty-one thousand, two hundred twenty".