2218431140 has 12 divisors (see below), whose sum is σ = 4658705436. Its totient is φ = 887372448.

The previous prime is 2218431119. The next prime is 2218431143. The reversal of 2218431140 is 411348122.

It can be written as a sum of positive squares in 2 ways, for example, as 434889316 + 1783541824 = 20854^2 + 42232^2 .

It is not an unprimeable number, because it can be changed into a prime (2218431143) 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, 55460759 + ... + 55460798.

It is an arithmetic number, because the mean of its divisors is an integer number (388225453).

Almost surely, 2^2218431140 is an apocalyptic number.

2218431140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2218431140 is an abundant number, since it is smaller than the sum of its proper divisors (2440274296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2218431140 is a wasteful number, since it uses less digits than its factorization.

2218431140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110921566 (or 110921564 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 2218431140 is about 47100.2244156012. The cubic root of 2218431140 is about 1304.2133787409.

Adding to 2218431140 its reverse (411348122), we get a palindrome (2629779262).

The spelling of 2218431140 in words is "two billion, two hundred eighteen million, four hundred thirty-one thousand, one hundred forty".