1840808799921 has 96 divisors (see below), whose sum is σ = 3089060502528. Its totient is φ = 966469553280.

The previous prime is 1840808799917. The next prime is 1840808799941. The reversal of 1840808799921 is 1299978080481.

It is not a de Polignac number, because 1840808799921 - 2² = 1840808799917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1840808799941) 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 95 ways as a sum of consecutive naturals, for example, 459855306 + ... + 459859308.

It is an arithmetic number, because the mean of its divisors is an integer number (32177713568).

Almost surely, 2^{1840808799921} is an apocalyptic number.

It is an amenable number.

1840808799921 is a deficient number, since it is larger than the sum of its proper divisors (1248251702607).

1840808799921 is a wasteful number, since it uses less digits than its factorization.

1840808799921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5091 (or 5084 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 66.

The spelling of 1840808799921 in words is "one trillion, eight hundred forty billion, eight hundred eight million, seven hundred ninety-nine thousand, nine hundred twenty-one".