131021111100 has 144 divisors (see below), whose sum is σ = 416969312256. Its totient is φ = 31762596800.

The previous prime is 131021111059. The next prime is 131021111119. The reversal of 131021111100 is 1111120131.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 235237 + ... + 563363.

It is an arithmetic number, because the mean of its divisors is an integer number (2895620224).

Almost surely, 2^131021111100 is an apocalyptic number.

131021111100 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 131021111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208484656128).

131021111100 is an abundant number, since it is smaller than the sum of its proper divisors (285948201156).

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

131021111100 is a wasteful number, since it uses less digits than its factorization.

131021111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328177 (or 328148 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 131021111100 its reverse (1111120131), we get a palindrome (132132231231).

The spelling of 131021111100 in words is "one hundred thirty-one billion, twenty-one million, one hundred eleven thousand, one hundred".