12172221860 has 36 divisors (see below), whose sum is σ = 26200399764. Its totient is φ = 4750122240.

The previous prime is 12172221797. The next prime is 12172221869. The reversal of 12172221860 is 6812227121.

12172221860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1957885504 + 10214336356 = 44248^2 + 101066^2 .

It is not an unprimeable number, because it can be changed into a prime (12172221869) 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 11 ways as a sum of consecutive naturals, for example, 147407 + ... + 214646.

Almost surely, 2^12172221860 is an apocalyptic number.

12172221860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12172221860 is an abundant number, since it is smaller than the sum of its proper divisors (14028177904).

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

12172221860 is a wasteful number, since it uses less digits than its factorization.

12172221860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362144 (or 362101 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

Adding to 12172221860 its reverse (6812227121), we get a palindrome (18984448981).

The spelling of 12172221860 in words is "twelve billion, one hundred seventy-two million, two hundred twenty-one thousand, eight hundred sixty".