229436821 has 2 divisors, whose sum is σ = 229436822. Its totient is φ = 229436820.

The previous prime is 229436807. The next prime is 229436827. The reversal of 229436821 is 128634922.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144336196 + 85100625 = 12014^2 + 9225^2 .

It is a cyclic number.

It is not a de Polignac number, because 229436821 - 2⁵ = 229436789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229436827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114718410 + 114718411.

It is an arithmetic number, because the mean of its divisors is an integer number (114718411).

Almost surely, 2^229436821 is an apocalyptic number.

It is an amenable number.

229436821 is a deficient number, since it is larger than the sum of its proper divisors (1).

229436821 is an equidigital number, since it uses as much as digits as its factorization.

229436821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 229436821 is about 15147.1720462930. The cubic root of 229436821 is about 612.1920782386.

The spelling of 229436821 in words is "two hundred twenty-nine million, four hundred thirty-six thousand, eight hundred twenty-one".