2187218540 has 24 divisors (see below), whose sum is σ = 4946479440. Its totient is φ = 807588288.

The previous prime is 2187218503. The next prime is 2187218567. The reversal of 2187218540 is 458127812.

It is a junction number, because it is equal to n+sod(n) for n = 2187218494 and 2187218503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4205930 + ... + 4206449.

It is an arithmetic number, because the mean of its divisors is an integer number (206103310).

Almost surely, 2^2187218540 is an apocalyptic number.

2187218540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2187218540 is an abundant number, since it is smaller than the sum of its proper divisors (2759260900).

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

2187218540 is a wasteful number, since it uses less digits than its factorization.

2187218540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8412401 (or 8412399 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 2187218540 is about 46767.7083039141. The cubic root of 2187218540 is about 1298.0678476694.

The spelling of 2187218540 in words is "two billion, one hundred eighty-seven million, two hundred eighteen thousand, five hundred forty".