21173416 has 16 divisors (see below), whose sum is σ = 43309440. Its totient is φ = 9624240.

The previous prime is 21173413. The next prime is 21173417. The reversal of 21173416 is 61437112.

It is not an unprimeable number, because it can be changed into a prime (21173413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120216 + ... + 120391.

It is an arithmetic number, because the mean of its divisors is an integer number (2706840).

Almost surely, 2^21173416 is an apocalyptic number.

It is an amenable number.

21173416 is an abundant number, since it is smaller than the sum of its proper divisors (22136024).

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

21173416 is a wasteful number, since it uses less digits than its factorization.

21173416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240624 (or 240620 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 21173416 is about 4601.4580297988. The cubic root of 21173416 is about 276.6497678425.

The spelling of 21173416 in words is "twenty-one million, one hundred seventy-three thousand, four hundred sixteen".