229664821 has 12 divisors (see below), whose sum is σ = 245963340. Its totient is φ = 214301120.

The previous prime is 229664807. The next prime is 229664839. The reversal of 229664821 is 128466922.

It can be written as a sum of positive squares in 2 ways, for example, as 19704721 + 209960100 = 4439^2 + 14490^2 .

It is not a de Polignac number, because 229664821 - 2²⁵ = 196110389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229664861) 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 11 ways as a sum of consecutive naturals, for example, 16395 + ... + 26983.

It is an arithmetic number, because the mean of its divisors is an integer number (20496945).

Almost surely, 2^229664821 is an apocalyptic number.

It is an amenable number.

229664821 is a deficient number, since it is larger than the sum of its proper divisors (16298519).

229664821 is a wasteful number, since it uses less digits than its factorization.

229664821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10676 (or 10653 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 229664821 is about 15154.6963348000. The cubic root of 229664821 is about 612.3947972029.

The spelling of 229664821 in words is "two hundred twenty-nine million, six hundred sixty-four thousand, eight hundred twenty-one".