21164853 has 16 divisors (see below), whose sum is σ = 29748096. Its totient is φ = 13358400.

The previous prime is 21164849. The next prime is 21164863. The reversal of 21164853 is 35846112.

It is not a de Polignac number, because 21164853 - 2² = 21164849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21164853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164833) 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 in 15 ways as a sum of consecutive naturals, for example, 5451 + ... + 8487.

It is an arithmetic number, because the mean of its divisors is an integer number (1859256).

Almost surely, 2^21164853 is an apocalyptic number.

21164853 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21164853 is a deficient number, since it is larger than the sum of its proper divisors (8583243).

21164853 is a wasteful number, since it uses less digits than its factorization.

21164853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3164.

The product of its digits is 5760, while the sum is 30.

The square root of 21164853 is about 4600.5274697582. The cubic root of 21164853 is about 276.6124683757.

The spelling of 21164853 in words is "twenty-one million, one hundred sixty-four thousand, eight hundred fifty-three".