21023231432 has 64 divisors (see below), whose sum is σ = 45938430720. Its totient is φ = 8832515328.

The previous prime is 21023231389. The next prime is 21023231477. The reversal of 21023231432 is 23413232012.

It is a junction number, because it is equal to n+sod(n) for n = 21023231398 and 21023231407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4856453 + ... + 4860779.

It is an arithmetic number, because the mean of its divisors is an integer number (717787980).

Almost surely, 2^21023231432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21023231432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22969215360).

21023231432 is an abundant number, since it is smaller than the sum of its proper divisors (24915199288).

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

21023231432 is a wasteful number, since it uses less digits than its factorization.

21023231432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6030 (or 6026 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21023231432 its reverse (23413232012), we get a palindrome (44436463444).

The spelling of 21023231432 in words is "twenty-one billion, twenty-three million, two hundred thirty-one thousand, four hundred thirty-two".