21116479 has 2 divisors, whose sum is σ = 21116480. Its totient is φ = 21116478.

The previous prime is 21116477. The next prime is 21116503. The reversal of 21116479 is 97461112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21116479 - 2¹ = 21116477 is a prime.

Together with 21116477, it forms a pair of twin primes.

It is equal to p_1336855 and since 21116479 and 1336855 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21116479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21116471) 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 as a sum of consecutive naturals, namely, 10558239 + 10558240.

It is an arithmetic number, because the mean of its divisors is an integer number (10558240).

Almost surely, 2^21116479 is an apocalyptic number.

21116479 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116479 is an equidigital number, since it uses as much as digits as its factorization.

21116479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 21116479 is about 4595.2670216213. The cubic root of 21116479 is about 276.4015674880.

The spelling of 21116479 in words is "twenty-one million, one hundred sixteen thousand, four hundred seventy-nine".