21423324032 has 64 divisors (see below), whose sum is σ = 46593016560. Its totient is φ = 9730805760.

The previous prime is 21423324031. The next prime is 21423324073. The reversal of 21423324032 is 23042332412.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21423323992 and 21423324010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423324031) 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, 2266388 + ... + 2275820.

Almost surely, 2^21423324032 is an apocalyptic number.

21423324032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21423324032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23296508280).

21423324032 is an abundant number, since it is smaller than the sum of its proper divisors (25169692528).

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

21423324032 is a wasteful number, since it uses less digits than its factorization.

21423324032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11071 (or 11059 counting only the distinct ones).

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

Adding to 21423324032 its reverse (23042332412), we get a palindrome (44465656444).

The spelling of 21423324032 in words is "twenty-one billion, four hundred twenty-three million, three hundred twenty-four thousand, thirty-two".