18471021800 has 96 divisors (see below), whose sum is σ = 53542019520. Its totient is φ = 5757196800.

The previous prime is 18471021791. The next prime is 18471021809. The reversal of 18471021800 is 812017481.

It is an interprime number because it is at equal distance from previous prime (18471021791) and next prime (18471021809).

It is not an unprimeable number, because it can be changed into a prime (18471021809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 584309 + ... + 615108.

It is an arithmetic number, because the mean of its divisors is an integer number (557729370).

Almost surely, 2^18471021800 is an apocalyptic number.

18471021800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18471021800 is an abundant number, since it is smaller than the sum of its proper divisors (35070997720).

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

18471021800 is a wasteful number, since it uses less digits than its factorization.

18471021800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199451 (or 1199442 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 32.

The spelling of 18471021800 in words is "eighteen billion, four hundred seventy-one million, twenty-one thousand, eight hundred".