12100056 has 64 divisors (see below), whose sum is σ = 32762880. Its totient is φ = 3709440.

The previous prime is 12100003. The next prime is 12100057. The reversal of 12100056 is 65000121.

It is a super-2 number, since 2×12100056² = 292822710406272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12100057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18861 + ... + 19491.

It is an arithmetic number, because the mean of its divisors is an integer number (511920).

Almost surely, 2^12100056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12100056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16381440).

12100056 is an abundant number, since it is smaller than the sum of its proper divisors (20662824).

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

12100056 is a wasteful number, since it uses less digits than its factorization.

12100056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 12100056 is about 3478.5134756099. The cubic root of 12100056 is about 229.5773966344.

Adding to 12100056 its reverse (65000121), we get a palindrome (77100177).

The spelling of 12100056 in words is "twelve million, one hundred thousand, fifty-six".