21703853 has 2 divisors, whose sum is σ = 21703854. Its totient is φ = 21703852.

The previous prime is 21703831. The next prime is 21703879. The reversal of 21703853 is 35830712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21696964 + 6889 = 4658^2 + 83^2 .

It is a cyclic number.

It is not a de Polignac number, because 21703853 - 2¹⁶ = 21638317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21703823) 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, 10851926 + 10851927.

It is an arithmetic number, because the mean of its divisors is an integer number (10851927).

Almost surely, 2^21703853 is an apocalyptic number.

It is an amenable number.

21703853 is a deficient number, since it is larger than the sum of its proper divisors (1).

21703853 is an equidigital number, since it uses as much as digits as its factorization.

21703853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21703853 is about 4658.7394217750. The cubic root of 21703853 is about 278.9409526339.

The spelling of 21703853 in words is "twenty-one million, seven hundred three thousand, eight hundred fifty-three".