12123320440 has 128 divisors (see below), whose sum is σ = 34055147520. Its totient is φ = 3773491200.

The previous prime is 12123320431. The next prime is 12123320453. The reversal of 12123320440 is 4402332121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2655760 + ... + 2660320.

It is an arithmetic number, because the mean of its divisors is an integer number (266055840).

Almost surely, 2^12123320440 is an apocalyptic number.

12123320440 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 12123320440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17027573760).

12123320440 is an abundant number, since it is smaller than the sum of its proper divisors (21931827080).

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

12123320440 is a wasteful number, since it uses less digits than its factorization.

12123320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5453 (or 5449 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 12123320440 its reverse (4402332121), we get a palindrome (16525652561).

The spelling of 12123320440 in words is "twelve billion, one hundred twenty-three million, three hundred twenty thousand, four hundred forty".