2101131220 has 12 divisors (see below), whose sum is σ = 4412375604. Its totient is φ = 840452480.

The previous prime is 2101131181. The next prime is 2101131233. The reversal of 2101131220 is 221311012.

It can be written as a sum of positive squares in 2 ways, for example, as 442849936 + 1658281284 = 21044^2 + 40722^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2101131220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52528261 + ... + 52528300.

It is an arithmetic number, because the mean of its divisors is an integer number (367697967).

Almost surely, 2^2101131220 is an apocalyptic number.

2101131220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2101131220 is an abundant number, since it is smaller than the sum of its proper divisors (2311244384).

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

2101131220 is a wasteful number, since it uses less digits than its factorization.

2101131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105056570 (or 105056568 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2101131220 is about 45838.0979099264. The cubic root of 2101131220 is about 1280.8090628810.

Adding to 2101131220 its reverse (221311012), we get a palindrome (2322442232).

The spelling of 2101131220 in words is "two billion, one hundred one million, one hundred thirty-one thousand, two hundred twenty".