16621132 has 24 divisors (see below), whose sum is σ = 31836672. Its totient is φ = 7530000.

The previous prime is 16621117. The next prime is 16621133. The reversal of 16621132 is 23112661.

It is a super-2 number, since 2×16621132² = 552524057922848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (16621133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21757 + ... + 22507.

It is an arithmetic number, because the mean of its divisors is an integer number (1326528).

Almost surely, 2^16621132 is an apocalyptic number.

It is an amenable number.

16621132 is a deficient number, since it is larger than the sum of its proper divisors (15215540).

16621132 is a wasteful number, since it uses less digits than its factorization.

16621132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1269 (or 1267 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 16621132 is about 4076.9022553895. The cubic root of 16621132 is about 255.2036409959.

Adding to 16621132 its reverse (23112661), we get a palindrome (39733793).

The spelling of 16621132 in words is "sixteen million, six hundred twenty-one thousand, one hundred thirty-two".