2821868358905 has 4 divisors (see below), whose sum is σ = 3386242030692. Its totient is φ = 2257494687120.

The previous prime is 2821868358901. The next prime is 2821868358961. The reversal of 2821868358905 is 5098538681282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1135953087721 + 1685915271184 = 1065811^2 + 1298428^2 .

It is not a de Polignac number, because 2821868358905 - 2² = 2821868358901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2821868358901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282186835886 + ... + 282186835895.

It is an arithmetic number, because the mean of its divisors is an integer number (846560507673).

Almost surely, 2^{2821868358905} is an apocalyptic number.

It is an amenable number.

2821868358905 is a deficient number, since it is larger than the sum of its proper divisors (564373671787).

2821868358905 is an equidigital number, since it uses as much as digits as its factorization.

2821868358905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564373671786.

The product of its (nonzero) digits is 66355200, while the sum is 65.

The spelling of 2821868358905 in words is "two trillion, eight hundred twenty-one billion, eight hundred sixty-eight million, three hundred fifty-eight thousand, nine hundred five".