12421432320 has 176 divisors, whose sum is σ = 43341507648. Its totient is φ = 3011215360.

The previous prime is 12421432273. The next prime is 12421432327. The reversal of 12421432320 is 2323412421.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (176).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (12421432327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132202 + ... + 205718.

Almost surely, 2^12421432320 is an apocalyptic number.

12421432320 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 12421432320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21670753824).

12421432320 is an abundant number, since it is smaller than the sum of its proper divisors (30920075328).

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

12421432320 is a wasteful number, since it uses less digits than its factorization.

12421432320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73556 (or 73538 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 12421432320 its reverse (2323412421), we get a palindrome (14744844741).

The spelling of 12421432320 in words is "twelve billion, four hundred twenty-one million, four hundred thirty-two thousand, three hundred twenty".