2129771878 has 16 divisors (see below), whose sum is σ = 3452155056. Its totient is φ = 979613280.

The previous prime is 2129771863. The next prime is 2129771881. The reversal of 2129771878 is 8781779212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132168 + ... + 147403.

It is an arithmetic number, because the mean of its divisors is an integer number (215759691).

Almost surely, 2^2129771878 is an apocalyptic number.

2129771878 is a deficient number, since it is larger than the sum of its proper divisors (1322383178).

2129771878 is a wasteful number, since it uses less digits than its factorization.

2129771878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279879.

The product of its digits is 790272, while the sum is 52.

The square root of 2129771878 is about 46149.4515460368. The cubic root of 2129771878 is about 1286.6024164391.

The spelling of 2129771878 in words is "two billion, one hundred twenty-nine million, seven hundred seventy-one thousand, eight hundred seventy-eight".