2128646811 has 16 divisors (see below), whose sum is σ = 2906696448. Its totient is φ = 1385244000.

The previous prime is 2128646753. The next prime is 2128646851. The reversal of 2128646811 is 1186468212.

It is not a de Polignac number, because 2128646811 - 2¹⁸ = 2128384667 is a prime.

It is a super-2 number, since 2×2128646811² = 9062274491960939442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2128646811.

It is not an unprimeable number, because it can be changed into a prime (2128646851) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 27961 + ... + 70986.

It is an arithmetic number, because the mean of its divisors is an integer number (181668528).

Almost surely, 2^2128646811 is an apocalyptic number.

2128646811 is a deficient number, since it is larger than the sum of its proper divisors (778049637).

2128646811 is a wasteful number, since it uses less digits than its factorization.

2128646811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99122.

The product of its digits is 36864, while the sum is 39.

The square root of 2128646811 is about 46137.2605493651. The cubic root of 2128646811 is about 1286.3758242710.

The spelling of 2128646811 in words is "two billion, one hundred twenty-eight million, six hundred forty-six thousand, eight hundred eleven".