2128155778924 has 24 divisors (see below), whose sum is σ = 4256497767200. Its totient is φ = 912026860416.

The previous prime is 2128155778849. The next prime is 2128155778939. The reversal of 2128155778924 is 4298775518212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006599 + ... + 2295550.

Almost surely, 2^{2128155778924} is an apocalyptic number.

It is an amenable number.

2128155778924 is an abundant number, since it is smaller than the sum of its proper divisors (2128341988276).

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

2128155778924 is a wasteful number, since it uses less digits than its factorization.

2128155778924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325177 (or 3325175 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 61.

The spelling of 2128155778924 in words is "two trillion, one hundred twenty-eight billion, one hundred fifty-five million, seven hundred seventy-eight thousand, nine hundred twenty-four".