2100120309 has 12 divisors (see below), whose sum is σ = 3466865376. Its totient is φ = 1200068712.

The previous prime is 2100120287. The next prime is 2100120329. The reversal of 2100120309 is 9030210012.

It is a happy number.

It is not a de Polignac number, because 2100120309 - 2¹³ = 2100112117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100120291 and 2100120300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100120329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16667559 + ... + 16667684.

It is an arithmetic number, because the mean of its divisors is an integer number (288905448).

Almost surely, 2^2100120309 is an apocalyptic number.

It is an amenable number.

2100120309 is a deficient number, since it is larger than the sum of its proper divisors (1366745067).

2100120309 is a wasteful number, since it uses less digits than its factorization.

2100120309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33335256 (or 33335253 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 2100120309 is about 45827.0696095659. The cubic root of 2100120309 is about 1280.6036193140.

The spelling of 2100120309 in words is "two billion, one hundred million, one hundred twenty thousand, three hundred nine".