131212112100 has 144 divisors (see below), whose sum is σ = 391017139968. Its totient is φ = 33946767360.

The previous prime is 131212112041. The next prime is 131212112113. The reversal of 131212112100 is 1211212131.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 131212112100.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3901557 + ... + 3935043.

Almost surely, 2^131212112100 is an apocalyptic number.

131212112100 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 131212112100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195508569984).

131212112100 is an abundant number, since it is smaller than the sum of its proper divisors (259805027868).

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

131212112100 is a wasteful number, since it uses less digits than its factorization.

131212112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33894 (or 33887 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 131212112100 its reverse (1211212131), we get a palindrome (132423324231).

The spelling of 131212112100 in words is "one hundred thirty-one billion, two hundred twelve million, one hundred twelve thousand, one hundred".