18210000000 has 256 divisors, whose sum is σ = 60562344960. Its totient is φ = 4848000000.

The previous prime is 18209999999. The next prime is 18210000001. The reversal of 18210000000 is 1281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18209999999) and next prime (18210000001).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (18210000001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29999697 + ... + 30000303.

It is an arithmetic number, because the mean of its divisors is an integer number (236571660).

Almost surely, 2^18210000000 is an apocalyptic number.

18210000000 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 18210000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30281172480).

18210000000 is an abundant number, since it is smaller than the sum of its proper divisors (42352344960).

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

18210000000 is an frugal number, since it uses more digits than its factorization.

18210000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 18210000000 its reverse (1281), we get a palindrome (18210001281).

The spelling of 18210000000 in words is "eighteen billion, two hundred ten million", and thus it is an aban number.