2705784921 has 12 divisors (see below), whose sum is σ = 4466692672. Its totient is φ = 1546162776.

The previous prime is 2705784919. The next prime is 2705784947. The reversal of 2705784921 is 1294875072.

It is a happy number.

2705784921 is a `hidden beast` number, since 2 + 70 + 578 + 4 + 9 + 2 + 1 = 666.

It is not a de Polignac number, because 2705784921 - 2¹ = 2705784919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2705784901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21474421 + ... + 21474546.

Almost surely, 2^2705784921 is an apocalyptic number.

2705784921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2705784921 is a deficient number, since it is larger than the sum of its proper divisors (1760907751).

2705784921 is a wasteful number, since it uses less digits than its factorization.

2705784921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42948980 (or 42948977 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 2705784921 is about 52017.1598705658. The cubic root of 2705784921 is about 1393.4704304799.

The spelling of 2705784921 in words is "two billion, seven hundred five million, seven hundred eighty-four thousand, nine hundred twenty-one".