21041532 has 60 divisors (see below), whose sum is σ = 55637736. Its totient is φ = 6933600.

The previous prime is 21041521. The next prime is 21041533. The reversal of 21041532 is 23514012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041533) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32403 + ... + 33045.

Almost surely, 2^21041532 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 21041532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27818868).

21041532 is an abundant number, since it is smaller than the sum of its proper divisors (34596204).

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

21041532 is a wasteful number, since it uses less digits than its factorization.

21041532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 749 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21041532 is about 4587.1049693679. The cubic root of 21041532 is about 276.0741766601.

Adding to 21041532 its reverse (23514012), we get a palindrome (44555544).

The spelling of 21041532 in words is "twenty-one million, forty-one thousand, five hundred thirty-two".