2821818841 has 4 divisors (see below), whose sum is σ = 2824616500. Its totient is φ = 2819021184.

The previous prime is 2821818827. The next prime is 2821818851. The reversal of 2821818841 is 1488181282.

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 1617728841 + 1204090000 = 40221^2 + 34700^2 .

It is a cyclic number.

It is not a de Polignac number, because 2821818841 - 2²³ = 2813430233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2821818821) 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, 1397316 + ... + 1399333.

It is an arithmetic number, because the mean of its divisors is an integer number (706154125).

Almost surely, 2^2821818841 is an apocalyptic number.

It is an amenable number.

2821818841 is a deficient number, since it is larger than the sum of its proper divisors (2797659).

2821818841 is a wasteful number, since it uses less digits than its factorization.

2821818841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797658.

The product of its digits is 65536, while the sum is 43.

The square root of 2821818841 is about 53120.7948076834. The cubic root of 2821818841 is about 1413.1113228853. Note that the first 3 decimals are identical.

The spelling of 2821818841 in words is "two billion, eight hundred twenty-one million, eight hundred eighteen thousand, eight hundred forty-one".