21084733 has 2 divisors, whose sum is σ = 21084734. Its totient is φ = 21084732.

The previous prime is 21084727. The next prime is 21084751. The reversal of 21084733 is 33748012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15194404 + 5890329 = 3898^2 + 2427^2 .

It is a cyclic number.

It is not a de Polignac number, because 21084733 - 2¹³ = 21076541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21084773) 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, 10542366 + 10542367.

It is an arithmetic number, because the mean of its divisors is an integer number (10542367).

Almost surely, 2^21084733 is an apocalyptic number.

It is an amenable number.

21084733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21084733 is an equidigital number, since it uses as much as digits as its factorization.

21084733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21084733 is about 4591.8115161666. The cubic root of 21084733 is about 276.2629862244.

The spelling of 21084733 in words is "twenty-one million, eighty-four thousand, seven hundred thirty-three".