21041832 has 64 divisors (see below), whose sum is σ = 60480000. Its totient is φ = 5976000.

The previous prime is 21041827. The next prime is 21041857. The reversal of 21041832 is 23814012.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21041799 and 21041808.

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, 41919 + ... + 42417.

It is an arithmetic number, because the mean of its divisors is an integer number (945000).

Almost surely, 2^21041832 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 21041832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30240000).

21041832 is an abundant number, since it is smaller than the sum of its proper divisors (39438168).

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

21041832 is a wasteful number, since it uses less digits than its factorization.

21041832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 21041832 is about 4587.1376696149. The cubic root of 21041832 is about 276.0754886980.

Adding to 21041832 its reverse (23814012), we get a palindrome (44855844).

It can be divided in two parts, 210418 and 32, that multiplied together give a palindrome (6733376).

The spelling of 21041832 in words is "twenty-one million, forty-one thousand, eight hundred thirty-two".