21416532 has 48 divisors (see below), whose sum is σ = 53242560. Its totient is φ = 6676992.

The previous prime is 21416531. The next prime is 21416539. The reversal of 21416532 is 23561412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56319 + ... + 56697.

It is an arithmetic number, because the mean of its divisors is an integer number (1109220).

Almost surely, 2^21416532 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 21416532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26621280).

21416532 is an abundant number, since it is smaller than the sum of its proper divisors (31826028).

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

21416532 is a wasteful number, since it uses less digits than its factorization.

21416532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 678 counting only the distinct ones).

The product of its digits is 1440, while the sum is 24.

The square root of 21416532 is about 4627.7999092441. The cubic root of 21416532 is about 277.7045841406.

Adding to 21416532 its reverse (23561412), we get a palindrome (44977944).

The spelling of 21416532 in words is "twenty-one million, four hundred sixteen thousand, five hundred thirty-two".