18821045000 has 40 divisors (see below), whose sum is σ = 44097720150. Its totient is φ = 7528416000.

The previous prime is 18821044999. The next prime is 18821045059. The reversal of 18821045000 is 54012881.

It can be written as a sum of positive squares in 5 ways, for example, as 844134916 + 17976910084 = 29054^2 + 134078^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1877105 + ... + 1887104.

Almost surely, 2^18821045000 is an apocalyptic number.

18821045000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18821045000 is an abundant number, since it is smaller than the sum of its proper divisors (25276675150).

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

18821045000 is an equidigital number, since it uses as much as digits as its factorization.

18821045000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3764235 (or 3764216 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

Adding to 18821045000 its reverse (54012881), we get a palindrome (18875057881).

The spelling of 18821045000 in words is "eighteen billion, eight hundred twenty-one million, forty-five thousand".