2180418021 has 20 divisors (see below), whose sum is σ = 3288803232. Its totient is φ = 1439493768.

The previous prime is 2180418013. The next prime is 2180418047. The reversal of 2180418021 is 1208140812.

2180418021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2180418021 - 2³ = 2180418013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180417021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 122331 + ... + 139016.

Almost surely, 2^2180418021 is an apocalyptic number.

It is an amenable number.

2180418021 is a deficient number, since it is larger than the sum of its proper divisors (1108385211).

2180418021 is a wasteful number, since it uses less digits than its factorization.

2180418021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261462 (or 261453 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 2180418021 is about 46694.9464182153. The cubic root of 2180418021 is about 1296.7211296622.

Adding to 2180418021 its reverse (1208140812), we get a palindrome (3388558833).

The spelling of 2180418021 in words is "two billion, one hundred eighty million, four hundred eighteen thousand, twenty-one".