180004021 has 4 divisors (see below), whose sum is σ = 180280332. Its totient is φ = 179727712.

The previous prime is 180003991. The next prime is 180004051. The reversal of 180004021 is 120400081.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (180003991) and next prime (180004051).

It can be written as a sum of positive squares in 2 ways, for example, as 52562500 + 127441521 = 7250^2 + 11289^2 .

It is a cyclic number.

It is not a de Polignac number, because 180004021 - 2¹⁹ = 179479733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 180003986 and 180004004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180004051) 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, 137176 + ... + 138481.

It is an arithmetic number, because the mean of its divisors is an integer number (45070083).

Almost surely, 2^180004021 is an apocalyptic number.

It is an amenable number.

180004021 is a deficient number, since it is larger than the sum of its proper divisors (276311).

180004021 is an equidigital number, since it uses as much as digits as its factorization.

180004021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276310.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 180004021 is about 13416.5577179841. The cubic root of 180004021 is about 564.6258216372.

The spelling of 180004021 in words is "one hundred eighty million, four thousand, twenty-one".