218887021872 has 100 divisors (see below), whose sum is σ = 650644919056. Its totient is φ = 70990369920.

The previous prime is 218887021823. The next prime is 218887021879. The reversal of 218887021872 is 278120788812.

It is a happy number.

218887021872 is a `hidden beast` number, since 218 + 88 + 70 + 218 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (218887021879) 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, 2234404 + ... + 2330307.

Almost surely, 2^218887021872 is an apocalyptic number.

It is an amenable number.

218887021872 is an abundant number, since it is smaller than the sum of its proper divisors (431757897184).

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

218887021872 is a wasteful number, since it uses less digits than its factorization.

218887021872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564768 (or 4564753 counting only the distinct ones).

The product of its (nonzero) digits is 1605632, while the sum is 54.

The spelling of 218887021872 in words is "two hundred eighteen billion, eight hundred eighty-seven million, twenty-one thousand, eight hundred seventy-two".