21314773 has 2 divisors, whose sum is σ = 21314774. Its totient is φ = 21314772.

The previous prime is 21314771. The next prime is 21314779. The reversal of 21314773 is 37741312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13373649 + 7941124 = 3657^2 + 2818^2 .

It is a cyclic number.

It is not a de Polignac number, because 21314773 - 2¹ = 21314771 is a prime.

Together with 21314771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21314771) 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, 10657386 + 10657387.

It is an arithmetic number, because the mean of its divisors is an integer number (10657387).

Almost surely, 2^21314773 is an apocalyptic number.

It is an amenable number.

21314773 is a deficient number, since it is larger than the sum of its proper divisors (1).

21314773 is an equidigital number, since it uses as much as digits as its factorization.

21314773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 21314773 is about 4616.7925012935. The cubic root of 21314773 is about 277.2640550511.

The spelling of 21314773 in words is "twenty-one million, three hundred fourteen thousand, seven hundred seventy-three".