12171012100 has 72 divisors (see below), whose sum is σ = 28785657600. Its totient is φ = 4439729280.

The previous prime is 12171012037. The next prime is 12171012103. The reversal of 12171012100 is 121017121.

It is not an unprimeable number, because it can be changed into a prime (12171012103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51501 + ... + 164299.

It is an arithmetic number, because the mean of its divisors is an integer number (399800800).

Almost surely, 2^12171012100 is an apocalyptic number.

12171012100 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 12171012100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14392828800).

12171012100 is an abundant number, since it is smaller than the sum of its proper divisors (16614645500).

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

12171012100 is a wasteful number, since it uses less digits than its factorization.

12171012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112909 (or 112902 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 12171012100 its reverse (121017121), we get a palindrome (12292029221).

The spelling of 12171012100 in words is "twelve billion, one hundred seventy-one million, twelve thousand, one hundred".