21432434232 has 32 divisors (see below), whose sum is σ = 58452094080. Its totient is φ = 6494676960.

The previous prime is 21432434213. The next prime is 21432434239. The reversal of 21432434232 is 23243423412.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21432434232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432434239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40591468 + ... + 40591995.

It is an arithmetic number, because the mean of its divisors is an integer number (1826627940).

Almost surely, 2^21432434232 is an apocalyptic number.

21432434232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21432434232 is an abundant number, since it is smaller than the sum of its proper divisors (37019659848).

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

21432434232 is a wasteful number, since it uses less digits than its factorization.

21432434232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81183483 (or 81183479 counting only the distinct ones).

The product of its digits is 27648, while the sum is 30.

Adding to 21432434232 its reverse (23243423412), we get a palindrome (44675857644).

The spelling of 21432434232 in words is "twenty-one billion, four hundred thirty-two million, four hundred thirty-four thousand, two hundred thirty-two".