16713621 has 10 divisors (see below), whose sum is σ = 24967382. Its totient is φ = 11142360.

The previous prime is 16713583. The next prime is 16713629. The reversal of 16713621 is 12631761.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 18225 = 4086^2 + 135^2 .

It is not a de Polignac number, because 16713621 - 2¹⁹ = 16189333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16713629) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 103090 + ... + 103251.

Almost surely, 2^16713621 is an apocalyptic number.

It is an amenable number.

16713621 is a deficient number, since it is larger than the sum of its proper divisors (8253761).

16713621 is an equidigital number, since it uses as much as digits as its factorization.

16713621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206353 (or 206344 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 16713621 is about 4088.2295679181. The cubic root of 16713621 is about 255.6761295413.

The spelling of 16713621 in words is "sixteen million, seven hundred thirteen thousand, six hundred twenty-one".