180021441 has 4 divisors (see below), whose sum is σ = 240028592. Its totient is φ = 120014292.

The previous prime is 180021419. The next prime is 180021497. The reversal of 180021441 is 144120081.

It is a happy number.

180021441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 180021441 - 2⁶ = 180021377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (180021341) 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, 30003571 + ... + 30003576.

It is an arithmetic number, because the mean of its divisors is an integer number (60007148).

Almost surely, 2^180021441 is an apocalyptic number.

It is an amenable number.

180021441 is a deficient number, since it is larger than the sum of its proper divisors (60007151).

180021441 is an equidigital number, since it uses as much as digits as its factorization.

180021441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60007150.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 180021441 is about 13417.2069000966. The cubic root of 180021441 is about 564.6440350535.

The spelling of 180021441 in words is "one hundred eighty million, twenty-one thousand, four hundred forty-one".