21416313 has 4 divisors (see below), whose sum is σ = 28555088. Its totient is φ = 14277540.

The previous prime is 21416281. The next prime is 21416321. The reversal of 21416313 is 31361412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21416313 - 2⁵ = 21416281 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21416313.

It is not an unprimeable number, because it can be changed into a prime (21416333) by changing a digit.

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, 3569383 + ... + 3569388.

It is an arithmetic number, because the mean of its divisors is an integer number (7138772).

Almost surely, 2^21416313 is an apocalyptic number.

It is an amenable number.

21416313 is a deficient number, since it is larger than the sum of its proper divisors (7138775).

21416313 is an equidigital number, since it uses as much as digits as its factorization.

21416313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7138774.

The product of its digits is 432, while the sum is 21.

The square root of 21416313 is about 4627.7762478322. The cubic root of 21416313 is about 277.7036375586.

Adding to 21416313 its reverse (31361412), we get a palindrome (52777725).

The spelling of 21416313 in words is "twenty-one million, four hundred sixteen thousand, three hundred thirteen".