180827021 has 4 divisors (see below), whose sum is σ = 181345500. Its totient is φ = 180308544.

The previous prime is 180826981. The next prime is 180827027. The reversal of 180827021 is 120728081.

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 104264521 + 76562500 = 10211^2 + 8750^2 .

It is a cyclic number.

It is not a de Polignac number, because 180827021 - 2¹⁸ = 180564877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180827027) 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, 258716 + ... + 259413.

It is an arithmetic number, because the mean of its divisors is an integer number (45336375).

Almost surely, 2^180827021 is an apocalyptic number.

It is an amenable number.

180827021 is a deficient number, since it is larger than the sum of its proper divisors (518479).

180827021 is an equidigital number, since it uses as much as digits as its factorization.

180827021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518478.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 180827021 is about 13447.1937964766. The cubic root of 180827021 is about 565.4850258564.

The spelling of 180827021 in words is "one hundred eighty million, eight hundred twenty-seven thousand, twenty-one".