12123424420 has 12 divisors (see below), whose sum is σ = 25459191324. Its totient is φ = 4849369760.

The previous prime is 12123424399. The next prime is 12123424427. The reversal of 12123424420 is 2442432121.

It can be written as a sum of positive squares in 2 ways, for example, as 5389909056 + 6733515364 = 73416^2 + 82058^2 .

It is not an unprimeable number, because it can be changed into a prime (12123424427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303085591 + ... + 303085630.

It is an arithmetic number, because the mean of its divisors is an integer number (2121599277).

Almost surely, 2^12123424420 is an apocalyptic number.

12123424420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12123424420 is an abundant number, since it is smaller than the sum of its proper divisors (13335766904).

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

12123424420 is a wasteful number, since it uses less digits than its factorization.

12123424420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606171230 (or 606171228 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 12123424420 its reverse (2442432121), we get a palindrome (14565856541).

The spelling of 12123424420 in words is "twelve billion, one hundred twenty-three million, four hundred twenty-four thousand, four hundred twenty".