21416316 has 12 divisors (see below), whose sum is σ = 49971432. Its totient is φ = 7138768.

The previous prime is 21416281. The next prime is 21416321. The reversal of 21416316 is 61361412.

It is a tau number, because it is divible by the number of its divisors (12).

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892335 + ... + 892358.

It is an arithmetic number, because the mean of its divisors is an integer number (4164286).

Almost surely, 2^21416316 is an apocalyptic number.

It is an amenable number.

21416316 is an abundant number, since it is smaller than the sum of its proper divisors (28555116).

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

21416316 is a wasteful number, since it uses less digits than its factorization.

21416316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784700 (or 1784698 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 21416316 is about 4627.7765719620. The cubic root of 21416316 is about 277.7036505255.

Adding to 21416316 its reverse (61361412), we get a palindrome (82777728).

The spelling of 21416316 in words is "twenty-one million, four hundred sixteen thousand, three hundred sixteen".