12360221661 has 32 divisors (see below), whose sum is σ = 17109671040. Its totient is φ = 7931520000.

The previous prime is 12360221651. The next prime is 12360221663. The reversal of 12360221661 is 16612206321.

12360221661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12360221661 - 2¹⁰ = 12360220637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12360221663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3363321 + ... + 3366993.

It is an arithmetic number, because the mean of its divisors is an integer number (534677220).

Almost surely, 2^12360221661 is an apocalyptic number.

It is an amenable number.

12360221661 is a deficient number, since it is larger than the sum of its proper divisors (4749449379).

12360221661 is a wasteful number, since it uses less digits than its factorization.

12360221661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4077.

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 12360221661 its reverse (16612206321), we get a palindrome (28972427982).

The spelling of 12360221661 in words is "twelve billion, three hundred sixty million, two hundred twenty-one thousand, six hundred sixty-one".