16621332 has 96 divisors (see below), whose sum is σ = 49373184. Its totient is φ = 4233600.

The previous prime is 16621309. The next prime is 16621357. The reversal of 16621332 is 23312661.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33607 + ... + 34097.

It is an arithmetic number, because the mean of its divisors is an integer number (514304).

Almost surely, 2^16621332 is an apocalyptic number.

16621332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16621332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24686592).

16621332 is an abundant number, since it is smaller than the sum of its proper divisors (32751852).

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

16621332 is a wasteful number, since it uses less digits than its factorization.

16621332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549 (or 547 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

The square root of 16621332 is about 4076.9267837429. The cubic root of 16621332 is about 255.2046646029.

Adding to 16621332 its reverse (23312661), we get a palindrome (39933993).

The spelling of 16621332 in words is "sixteen million, six hundred twenty-one thousand, three hundred thirty-two".