8421218900 has 36 divisors (see below), whose sum is σ = 18699032352. Its totient is φ = 3290148960.

The previous prime is 8421218891. The next prime is 8421218941. The reversal of 8421218900 is 98121248.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 974912 + ... + 983511.

Almost surely, 2^8421218900 is an apocalyptic number.

It is an amenable number.

8421218900 is an abundant number, since it is smaller than the sum of its proper divisors (10277813452).

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

8421218900 is a wasteful number, since it uses less digits than its factorization.

8421218900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958480 (or 1958473 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 8421218900 is about 91767.1994778091. The cubic root of 8421218900 is about 2034.5029262022.

The spelling of 8421218900 in words is "eight billion, four hundred twenty-one million, two hundred eighteen thousand, nine hundred".