2121788977 has 16 divisors (see below), whose sum is σ = 2652291072. Its totient is φ = 1649002320.

The previous prime is 2121788969. The next prime is 2121789001. The reversal of 2121788977 is 7798871212.

It is not a de Polignac number, because 2121788977 - 2³ = 2121788969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121788917) 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, 6483 + ... + 65464.

It is an arithmetic number, because the mean of its divisors is an integer number (165768192).

Almost surely, 2^2121788977 is an apocalyptic number.

It is an amenable number.

2121788977 is a deficient number, since it is larger than the sum of its proper divisors (530502095).

2121788977 is a wasteful number, since it uses less digits than its factorization.

2121788977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72348.

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

The square root of 2121788977 is about 46062.8806849941. The cubic root of 2121788977 is about 1284.9929046225.

The spelling of 2121788977 in words is "two billion, one hundred twenty-one million, seven hundred eighty-eight thousand, nine hundred seventy-seven".