12121112100 has 72 divisors (see below), whose sum is σ = 35410997440. Its totient is φ = 3200906880.

The previous prime is 12121112099. The next prime is 12121112123. The reversal of 12121112100 is 121112121.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165235 + ... + 227034.

Almost surely, 2^12121112100 is an apocalyptic number.

12121112100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121112100 is an abundant number, since it is smaller than the sum of its proper divisors (23289885340).

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

12121112100 is a wasteful number, since it uses less digits than its factorization.

12121112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392389 (or 392382 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12121112100 its reverse (121112121), we get a palindrome (12242224221).

The spelling of 12121112100 in words is "twelve billion, one hundred twenty-one million, one hundred twelve thousand, one hundred".