12321023232 has 144 divisors (see below), whose sum is σ = 38348710400. Its totient is φ = 3438360576.

The previous prime is 12321023213. The next prime is 12321023243. The reversal of 12321023232 is 23232012321.

It is a happy number.

It is a super-2 number, since 2×12321023232² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 12321023199 and 12321023208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204519 + ... + 257817.

Almost surely, 2^12321023232 is an apocalyptic number.

12321023232 is a gapful number since it is divisible by the number (12) 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 12321023232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19174355200).

12321023232 is an abundant number, since it is smaller than the sum of its proper divisors (26027687168).

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

12321023232 is an equidigital number, since it uses as much as digits as its factorization.

12321023232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53368 (or 53354 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 12321023232 its reverse (23232012321), we get a palindrome (35553035553).

The spelling of 12321023232 in words is "twelve billion, three hundred twenty-one million, twenty-three thousand, two hundred thirty-two".