21234320432 has 20 divisors (see below), whose sum is σ = 44306226720. Its totient is φ = 9800455488.

The previous prime is 21234320417. The next prime is 21234320507. The reversal of 21234320432 is 23402343212.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51043832 + ... + 51044247.

It is an arithmetic number, because the mean of its divisors is an integer number (2215311336).

Almost surely, 2^21234320432 is an apocalyptic number.

It is an amenable number.

21234320432 is an abundant number, since it is smaller than the sum of its proper divisors (23071906288).

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

21234320432 is a wasteful number, since it uses less digits than its factorization.

21234320432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102088100 (or 102088094 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21234320432 its reverse (23402343212), we get a palindrome (44636663644).

The spelling of 21234320432 in words is "twenty-one billion, two hundred thirty-four million, three hundred twenty thousand, four hundred thirty-two".