2101201220 has 36 divisors (see below), whose sum is σ = 4488727404. Its totient is φ = 826207680.

The previous prime is 2101201183. The next prime is 2101201237. The reversal of 2101201220 is 221021012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 856381696 + 1244819524 = 29264^2 + 35282^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54530 + ... + 84710.

Almost surely, 2^2101201220 is an apocalyptic number.

2101201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101201220 is an abundant number, since it is smaller than the sum of its proper divisors (2387526184).

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

2101201220 is a wasteful number, since it uses less digits than its factorization.

2101201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30308 (or 30247 counting only the distinct ones).

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

The square root of 2101201220 is about 45838.8614605555. The cubic root of 2101201220 is about 1280.8232862730.

Adding to 2101201220 its reverse (221021012), we get a palindrome (2322222232).

The spelling of 2101201220 in words is "two billion, one hundred one million, two hundred one thousand, two hundred twenty".