2100605220 has 72 divisors (see below), whose sum is σ = 7282102464. Its totient is φ = 480138048.

The previous prime is 2100605201. The next prime is 2100605237. The reversal of 2100605220 is 225060012.

2100605220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2100605193 and 2100605202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 832314 + ... + 834833.

It is an arithmetic number, because the mean of its divisors is an integer number (101140312).

Almost surely, 2^2100605220 is an apocalyptic number.

2100605220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100605220 is an abundant number, since it is smaller than the sum of its proper divisors (5181497244).

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

2100605220 is a wasteful number, since it uses less digits than its factorization.

2100605220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667169 (or 1667164 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2100605220 is about 45832.3599654218. The cubic root of 2100605220 is about 1280.7021741430.

Adding to 2100605220 its reverse (225060012), we get a palindrome (2325665232).

The spelling of 2100605220 in words is "two billion, one hundred million, six hundred five thousand, two hundred twenty".