12111344421 has 16 divisors (see below), whose sum is σ = 18092624448. Its totient is φ = 7141824000.

The previous prime is 12111344387. The next prime is 12111344423. The reversal of 12111344421 is 12444311121.

It is a happy number.

12111344421 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 12111344421 - 2¹⁰ = 12111343397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111344391 and 12111344400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111344423) 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 15 ways as a sum of consecutive naturals, for example, 4958380 + ... + 4960821.

It is an arithmetic number, because the mean of its divisors is an integer number (1130789028).

Almost surely, 2^12111344421 is an apocalyptic number.

12111344421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111344421 is a deficient number, since it is larger than the sum of its proper divisors (5981280027).

12111344421 is a wasteful number, since it uses less digits than its factorization.

12111344421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9919252.

The product of its digits is 768, while the sum is 24.

Adding to 12111344421 its reverse (12444311121), we get a palindrome (24555655542).

The spelling of 12111344421 in words is "twelve billion, one hundred eleven million, three hundred forty-four thousand, four hundred twenty-one".