1821327205 has 8 divisors (see below), whose sum is σ = 2186060832. Its totient is φ = 1456749648.

The previous prime is 1821327149. The next prime is 1821327241. The reversal of 1821327205 is 5027231281.

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

It is a cyclic number.

It is not a de Polignac number, because 1821327205 - 2¹³ = 1821319013 is a prime.

It is a super-2 number, since 2×1821327205² = 6634465575346224050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11587 + ... + 61456.

It is an arithmetic number, because the mean of its divisors is an integer number (273257604).

Almost surely, 2^1821327205 is an apocalyptic number.

It is an amenable number.

1821327205 is a deficient number, since it is larger than the sum of its proper divisors (364733627).

1821327205 is an equidigital number, since it uses as much as digits as its factorization.

1821327205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78035.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1821327205 is about 42677.0102631382. The cubic root of 1821327205 is about 1221.2258584542.

Adding to 1821327205 its reverse (5027231281), we get a palindrome (6848558486).

The spelling of 1821327205 in words is "one billion, eight hundred twenty-one million, three hundred twenty-seven thousand, two hundred five".