21023832 has 48 divisors (see below), whose sum is σ = 55897560. Its totient is φ = 6566656.

The previous prime is 21023831. The next prime is 21023837. The reversal of 21023832 is 23832012.

It is a junction number, because it is equal to n+sod(n) for n = 21023799 and 21023808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92503 + ... + 92729.

Almost surely, 2^21023832 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 21023832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27948780).

21023832 is an abundant number, since it is smaller than the sum of its proper divisors (34873728).

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

21023832 is a wasteful number, since it uses less digits than its factorization.

21023832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21023832 is about 4585.1752420164. The cubic root of 21023832 is about 275.9967443430.

Adding to 21023832 its reverse (23832012), we get a palindrome (44855844).

It can be divided in two parts, 210 and 23832, that added together give a palindrome (24042).

The spelling of 21023832 in words is "twenty-one million, twenty-three thousand, eight hundred thirty-two".