12320021232 has 30 divisors (see below), whose sum is σ = 34478948712. Its totient is φ = 4106673696.

The previous prime is 12320021213. The next prime is 12320021237. The reversal of 12320021232 is 23212002321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320021237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42777708 + ... + 42777995.

Almost surely, 2^12320021232 is an apocalyptic number.

12320021232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12320021232 is an abundant number, since it is smaller than the sum of its proper divisors (22158927480).

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

12320021232 is a wasteful number, since it uses less digits than its factorization.

12320021232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85555717 (or 85555708 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 12320021232 its reverse (23212002321), we get a palindrome (35532023553).

The spelling of 12320021232 in words is "twelve billion, three hundred twenty million, twenty-one thousand, two hundred thirty-two".