18321120000 has 360 divisors, whose sum is σ = 67717760880. Its totient is φ = 4884480000.

The previous prime is 18321119989. The next prime is 18321120017. The reversal of 18321120000 is 2112381.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4317880 + ... + 4322120.

Almost surely, 2^18321120000 is an apocalyptic number.

18321120000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18321120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33858880440).

18321120000 is an abundant number, since it is smaller than the sum of its proper divisors (49396640880).

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

18321120000 is an frugal number, since it uses more digits than its factorization.

18321120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4286 (or 4251 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 18321120000 its reverse (2112381), we get a palindrome (18323232381).

The spelling of 18321120000 in words is "eighteen billion, three hundred twenty-one million, one hundred twenty thousand".