2128776621 has 8 divisors (see below), whose sum is σ = 2907597504. Its totient is φ = 1384570080.

The previous prime is 2128776589. The next prime is 2128776673. The reversal of 2128776621 is 1266778212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2128776621 - 2⁵ = 2128776589 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128776421) 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 7 ways as a sum of consecutive naturals, for example, 8653441 + ... + 8653686.

It is an arithmetic number, because the mean of its divisors is an integer number (363449688).

Almost surely, 2^2128776621 is an apocalyptic number.

It is an amenable number.

2128776621 is a deficient number, since it is larger than the sum of its proper divisors (778820883).

2128776621 is a wasteful number, since it uses less digits than its factorization.

2128776621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17307171.

The product of its digits is 112896, while the sum is 42.

The square root of 2128776621 is about 46138.6673084518. The cubic root of 2128776621 is about 1286.4019725029.

The spelling of 2128776621 in words is "two billion, one hundred twenty-eight million, seven hundred seventy-six thousand, six hundred twenty-one".