21432434233 has 32 divisors (see below), whose sum is σ = 25762176000. Its totient is φ = 17813380032.

The previous prime is 21432434213. The next prime is 21432434239. The reversal of 21432434233 is 33243423412.

It is a happy number.

It is not a de Polignac number, because 21432434233 - 2⁵ = 21432434201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21432434195 and 21432434204.

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

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1751091 + ... + 1763287.

It is an arithmetic number, because the mean of its divisors is an integer number (805068000).

Almost surely, 2^21432434233 is an apocalyptic number.

It is an amenable number.

21432434233 is a deficient number, since it is larger than the sum of its proper divisors (4329741767).

21432434233 is a wasteful number, since it uses less digits than its factorization.

21432434233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12374 (or 12360 counting only the distinct ones).

The product of its digits is 41472, while the sum is 31.

Adding to 21432434233 its reverse (33243423412), we get a palindrome (54675857645).

The spelling of 21432434233 in words is "twenty-one billion, four hundred thirty-two million, four hundred thirty-four thousand, two hundred thirty-three".