2100130020 has 72 divisors (see below), whose sum is σ = 6745133304. Its totient is φ = 527090688.

The previous prime is 2100130013. The next prime is 2100130051. The reversal of 2100130020 is 200310012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 350213796 + 1749916224 = 18714^2 + 41832^2 .

It is a super-2 number, since 2×2100130020² = 8821092201810400800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2100129984 and 2100130011.

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 23 ways as a sum of consecutive naturals, for example, 340099 + ... + 346218.

It is an arithmetic number, because the mean of its divisors is an integer number (93682407).

Almost surely, 2^2100130020 is an apocalyptic number.

2100130020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100130020 is an abundant number, since it is smaller than the sum of its proper divisors (4645003284).

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

2100130020 is a wasteful number, since it uses less digits than its factorization.

2100130020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686349 (or 686344 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 2100130020 is about 45827.1755621051. The cubic root of 2100130020 is about 1280.6055931568.

Adding to 2100130020 its reverse (200310012), we get a palindrome (2300440032).

The spelling of 2100130020 in words is "two billion, one hundred million, one hundred thirty thousand, twenty".