12156023700 has 288 divisors, whose sum is σ = 40103683200. Its totient is φ = 3157724160.

The previous prime is 12156023683. The next prime is 12156023749. The reversal of 12156023700 is 732065121.

It is a happy number.

12156023700 is a `hidden beast` number, since 1 + 21 + 5 + 602 + 37 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21823822 + ... + 21824378.

It is an arithmetic number, because the mean of its divisors is an integer number (139248900).

Almost surely, 2^12156023700 is an apocalyptic number.

12156023700 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 12156023700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20051841600).

12156023700 is an abundant number, since it is smaller than the sum of its proper divisors (27947659500).

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

12156023700 is a wasteful number, since it uses less digits than its factorization.

12156023700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

Adding to 12156023700 its reverse (732065121), we get a palindrome (12888088821).

The spelling of 12156023700 in words is "twelve billion, one hundred fifty-six million, twenty-three thousand, seven hundred".