21223312432 has 40 divisors (see below), whose sum is σ = 47023149056. Its totient is φ = 9090156096.

The previous prime is 21223312427. The next prime is 21223312441. The reversal of 21223312432 is 23421332212.

It is a junction number, because it is equal to n+sod(n) for n = 21223312397 and 21223312406.

It is an unprimeable number.

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, 129283 + ... + 243229.

Almost surely, 2^21223312432 is an apocalyptic number.

It is an amenable number.

21223312432 is an abundant number, since it is smaller than the sum of its proper divisors (25799836624).

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

21223312432 is a wasteful number, since it uses less digits than its factorization.

21223312432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115625 (or 115619 counting only the distinct ones).

The product of its digits is 3456, while the sum is 25.

Adding to 21223312432 its reverse (23421332212), we get a palindrome (44644644644).

The spelling of 21223312432 in words is "twenty-one billion, two hundred twenty-three million, three hundred twelve thousand, four hundred thirty-two".