21702853 has 2 divisors, whose sum is σ = 21702854. Its totient is φ = 21702852.

The previous prime is 21702851. The next prime is 21702859. The reversal of 21702853 is 35820712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20958084 + 744769 = 4578^2 + 863^2 .

It is a cyclic number.

It is not a de Polignac number, because 21702853 - 2¹ = 21702851 is a prime.

Together with 21702851, 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 (21702851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10851426 + 10851427.

It is an arithmetic number, because the mean of its divisors is an integer number (10851427).

Almost surely, 2^21702853 is an apocalyptic number.

It is an amenable number.

21702853 is a deficient number, since it is larger than the sum of its proper divisors (1).

21702853 is an equidigital number, since it uses as much as digits as its factorization.

21702853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 21702853 is about 4658.6320953688. The cubic root of 21702853 is about 278.9366685215.

The spelling of 21702853 in words is "twenty-one million, seven hundred two thousand, eight hundred fifty-three".