218310440820 has 48 divisors (see below), whose sum is σ = 611766812160. Its totient is φ = 58168729216.

The previous prime is 218310440807. The next prime is 218310440827. The reversal of 218310440820 is 28044013812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218310440827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1406532 + ... + 1554011.

It is an arithmetic number, because the mean of its divisors is an integer number (12745141920).

Almost surely, 2^218310440820 is an apocalyptic number.

218310440820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218310440820 is an abundant number, since it is smaller than the sum of its proper divisors (393456371340).

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

218310440820 is a wasteful number, since it uses less digits than its factorization.

218310440820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961784 (or 2961782 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The spelling of 218310440820 in words is "two hundred eighteen billion, three hundred ten million, four hundred forty thousand, eight hundred twenty".