180021 has 8 divisors (see below), whose sum is σ = 250560. Its totient is φ = 114752.

The previous prime is 180007. The next prime is 180023. The reversal of 180021 is 120081.

It is a happy number.

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 180021 - 2⁵ = 179989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 179979 and 180006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (180023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1236 + ... + 1373.

It is an arithmetic number, because the mean of its divisors is an integer number (31320).

2¹⁸⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

180021 is a deficient number, since it is larger than the sum of its proper divisors (70539).

180021 is a wasteful number, since it uses less digits than its factorization.

180021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 180021 is about 424.2888167275. The cubic root of 180021 is about 56.4643573982.

The spelling of 180021 in words is "one hundred eighty thousand, twenty-one".