18121427712 has 108 divisors (see below), whose sum is σ = 55322106840. Its totient is φ = 5685141504.

The previous prime is 18121427711. The next prime is 18121427713. The reversal of 18121427712 is 21772412181.

It is an interprime number because it is at equal distance from previous prime (18121427711) and next prime (18121427713).

It is a super-2 number, since 2×18121427712² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18121427711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192162 + ... + 270497.

It is an arithmetic number, because the mean of its divisors is an integer number (512241730).

Almost surely, 2^18121427712 is an apocalyptic number.

18121427712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18121427712 is an abundant number, since it is smaller than the sum of its proper divisors (37200679128).

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

18121427712 is a wasteful number, since it uses less digits than its factorization.

18121427712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462698 (or 462681 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

Adding to 18121427712 its reverse (21772412181), we get a palindrome (39893839893).

The spelling of 18121427712 in words is "eighteen billion, one hundred twenty-one million, four hundred twenty-seven thousand, seven hundred twelve".