218808099420 has 24 divisors (see below), whose sum is σ = 612662678544. Its totient is φ = 58348826496.

The previous prime is 218808099371. The next prime is 218808099427. The reversal of 218808099420 is 24990808812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218808099427) 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, 1823400769 + ... + 1823400888.

It is an arithmetic number, because the mean of its divisors is an integer number (25527611606).

Almost surely, 2^218808099420 is an apocalyptic number.

218808099420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218808099420 is an abundant number, since it is smaller than the sum of its proper divisors (393854579124).

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

218808099420 is a wasteful number, since it uses less digits than its factorization.

218808099420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3646801669 (or 3646801667 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 51.

The spelling of 218808099420 in words is "two hundred eighteen billion, eight hundred eight million, ninety-nine thousand, four hundred twenty".