18291020112 has 120 divisors (see below), whose sum is σ = 53460935424. Its totient is φ = 5826915072.

The previous prime is 18291020107. The next prime is 18291020119. The reversal of 18291020112 is 21102019281.

It is a super-3 number, since 3×18291020112³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18291020119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6831318 + ... + 6833994.

Almost surely, 2^18291020112 is an apocalyptic number.

18291020112 is a gapful number since it is divisible by the number (12) 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 18291020112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26730467712).

18291020112 is an abundant number, since it is smaller than the sum of its proper divisors (35169915312).

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

18291020112 is a wasteful number, since it uses less digits than its factorization.

18291020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4777 (or 4768 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

Adding to 18291020112 its reverse (21102019281), we get a palindrome (39393039393).

The spelling of 18291020112 in words is "eighteen billion, two hundred ninety-one million, twenty thousand, one hundred twelve".