218831881220 has 24 divisors (see below), whose sum is σ = 459556579608. Its totient is φ = 87530918400.

The previous prime is 218831881211. The next prime is 218831881223. The reversal of 218831881220 is 22188138812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 85938095104 + 132893786116 = 293152^2 + 364546^2 .

It is not an unprimeable number, because it can be changed into a prime (218831881223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1274060 + ... + 1435580.

It is an arithmetic number, because the mean of its divisors is an integer number (19148190817).

Almost surely, 2^218831881220 is an apocalyptic number.

218831881220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218831881220 is an abundant number, since it is smaller than the sum of its proper divisors (240724698388).

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

218831881220 is a wasteful number, since it uses less digits than its factorization.

218831881220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229271 (or 229269 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 44.

The spelling of 218831881220 in words is "two hundred eighteen billion, eight hundred thirty-one million, eight hundred eighty-one thousand, two hundred twenty".