12111421420 has 96 divisors (see below), whose sum is σ = 30697325568. Its totient is φ = 3924003072.

The previous prime is 12111421393. The next prime is 12111421423. The reversal of 12111421420 is 2412411121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12111421423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 244602 + ... + 289918.

It is an arithmetic number, because the mean of its divisors is an integer number (319763808).

Almost surely, 2^12111421420 is an apocalyptic number.

12111421420 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 12111421420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15348662784).

12111421420 is an abundant number, since it is smaller than the sum of its proper divisors (18585904148).

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

12111421420 is a wasteful number, since it uses less digits than its factorization.

12111421420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45439 (or 45437 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12111421420 its reverse (2412411121), we get a palindrome (14523832541).

The spelling of 12111421420 in words is "twelve billion, one hundred eleven million, four hundred twenty-one thousand, four hundred twenty".