229051921 has 6 divisors (see below), whose sum is σ = 266448210. Its totient is φ = 196330176.

The previous prime is 229051909. The next prime is 229051951. The reversal of 229051921 is 129150922.

It can be written as a sum of positive squares in only one way, i.e., 171898321 + 57153600 = 13111^2 + 7560^2 .

It is not a de Polignac number, because 229051921 - 2⁹ = 229051409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (229051951) 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 5 ways as a sum of consecutive naturals, for example, 2337216 + ... + 2337313.

It is an arithmetic number, because the mean of its divisors is an integer number (44408035).

Almost surely, 2^229051921 is an apocalyptic number.

It is an amenable number.

229051921 is a deficient number, since it is larger than the sum of its proper divisors (37396289).

229051921 is an equidigital number, since it uses as much as digits as its factorization.

229051921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674543 (or 4674536 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 229051921 is about 15134.4613713208. The cubic root of 229051921 is about 611.8495516736.

Subtracting from 229051921 its reverse (129150922), we obtain a palindrome (99900999).

The spelling of 229051921 in words is "two hundred twenty-nine million, fifty-one thousand, nine hundred twenty-one".