12100100 has 18 divisors (see below), whose sum is σ = 26257434. Its totient is φ = 4840000.

The previous prime is 12100097. The next prime is 12100111. The reversal of 12100100 is 100121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 917764 + 11182336 = 958^2 + 3344^2 .

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60401 + ... + 60600.

Almost surely, 2^12100100 is an apocalyptic number.

12100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12100100 is an abundant number, since it is smaller than the sum of its proper divisors (14157334).

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

12100100 is a wasteful number, since it uses less digits than its factorization.

12100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121015 (or 121008 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 12100100 is about 3478.5198001449. The cubic root of 12100100 is about 229.5776749085.

Adding to 12100100 its reverse (100121), we get a palindrome (12200221).

The spelling of 12100100 in words is "twelve million, one hundred thousand, one hundred".