12166421440 has 56 divisors (see below), whose sum is σ = 28980993600. Its totient is φ = 4864939008.

The previous prime is 12166421401. The next prime is 12166421459. The reversal of 12166421440 is 4412466121.

12166421440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1526586 + ... + 1534534.

Almost surely, 2^12166421440 is an apocalyptic number.

12166421440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12166421440 is an abundant number, since it is smaller than the sum of its proper divisors (16814572160).

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

12166421440 is an equidigital number, since it uses as much as digits as its factorization.

12166421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12749 (or 12739 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 12166421440 its reverse (4412466121), we get a palindrome (16578887561).

The spelling of 12166421440 in words is "twelve billion, one hundred sixty-six million, four hundred twenty-one thousand, four hundred forty".