2182827821 has 4 divisors (see below), whose sum is σ = 2185806492. Its totient is φ = 2179849152.

The previous prime is 2182827743. The next prime is 2182827859. The reversal of 2182827821 is 1287282812.

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 1758879721 + 423948100 = 41939^2 + 20590^2 .

It is a cyclic number.

It is not a de Polignac number, because 2182827821 - 2¹⁰ = 2182826797 is a prime.

It is a super-2 number, since 2×2182827821² = 9529474592263216082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2182827221) 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, 1488236 + ... + 1489701.

It is an arithmetic number, because the mean of its divisors is an integer number (546451623).

Almost surely, 2^2182827821 is an apocalyptic number.

It is an amenable number.

2182827821 is a deficient number, since it is larger than the sum of its proper divisors (2978671).

2182827821 is an equidigital number, since it uses as much as digits as its factorization.

2182827821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978670.

The product of its digits is 57344, while the sum is 41.

The square root of 2182827821 is about 46720.7429414388. The cubic root of 2182827821 is about 1297.1986662420.

The spelling of 2182827821 in words is "two billion, one hundred eighty-two million, eight hundred twenty-seven thousand, eight hundred twenty-one".