2100780129 has 16 divisors (see below), whose sum is σ = 3202840448. Its totient is φ = 1199826432.

The previous prime is 2100780127. The next prime is 2100780161. The reversal of 2100780129 is 9210870012.

It is not a de Polignac number, because 2100780129 - 2¹ = 2100780127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100780096 and 2100780105.

It is not an unprimeable number, because it can be changed into a prime (2100780127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17559 + ... + 67155.

It is an arithmetic number, because the mean of its divisors is an integer number (200177528).

Almost surely, 2^2100780129 is an apocalyptic number.

It is an amenable number.

2100780129 is a deficient number, since it is larger than the sum of its proper divisors (1102060319).

2100780129 is a wasteful number, since it uses less digits than its factorization.

2100780129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51624.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 2100780129 is about 45834.2680644079. The cubic root of 2100780129 is about 1280.7377194733.

The spelling of 2100780129 in words is "two billion, one hundred million, seven hundred eighty thousand, one hundred twenty-nine".