218640201 has 24 divisors (see below), whose sum is σ = 332298720. Its totient is φ = 127460736.

The previous prime is 218640143. The next prime is 218640223. The reversal of 218640201 is 102046812.

It is not a de Polignac number, because 218640201 - 2⁶ = 218640137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218640901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1716 + ... + 20981.

It is an arithmetic number, because the mean of its divisors is an integer number (13845780).

Almost surely, 2^218640201 is an apocalyptic number.

It is an amenable number.

218640201 is a deficient number, since it is larger than the sum of its proper divisors (113658519).

218640201 is a wasteful number, since it uses less digits than its factorization.

218640201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22745 (or 22732 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 218640201 is about 14786.4871081674. The cubic root of 218640201 is about 602.4347372823.

The spelling of 218640201 in words is "two hundred eighteen million, six hundred forty thousand, two hundred one".