12021432432 has 40 divisors (see below), whose sum is σ = 31059607296. Its totient is φ = 4006597056.

The previous prime is 12021432431. The next prime is 12021432457. The reversal of 12021432432 is 23423412021.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021432431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498313 + ... + 521879.

Almost surely, 2^12021432432 is an apocalyptic number.

12021432432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12021432432 is an abundant number, since it is smaller than the sum of its proper divisors (19038174864).

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

12021432432 is a wasteful number, since it uses less digits than its factorization.

12021432432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34205 (or 34199 counting only the distinct ones).

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

Adding to 12021432432 its reverse (23423412021), we get a palindrome (35444844453).

The spelling of 12021432432 in words is "twelve billion, twenty-one million, four hundred thirty-two thousand, four hundred thirty-two".