2821920905 has 8 divisors (see below), whose sum is σ = 3404035584. Its totient is φ = 2245716400.

The previous prime is 2821920877. The next prime is 2821920919. The reversal of 2821920905 is 5090291282.

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

It is not a de Polignac number, because 2821920905 - 2⁶ = 2821920841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1476491 + ... + 1478400.

It is an arithmetic number, because the mean of its divisors is an integer number (425504448).

Almost surely, 2^2821920905 is an apocalyptic number.

It is an amenable number.

2821920905 is a deficient number, since it is larger than the sum of its proper divisors (582114679).

2821920905 is a wasteful number, since it uses less digits than its factorization.

2821920905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955087.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 2821920905 is about 53121.7554773936. The cubic root of 2821920905 is about 1413.1283598939.

The spelling of 2821920905 in words is "two billion, eight hundred twenty-one million, nine hundred twenty thousand, nine hundred five".