228204121 has 2 divisors, whose sum is σ = 228204122. Its totient is φ = 228204120.

The previous prime is 228204089. The next prime is 228204133. The reversal of 228204121 is 121402822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164762896 + 63441225 = 12836^2 + 7965^2 .

It is a cyclic number.

It is not a de Polignac number, because 228204121 - 2⁵ = 228204089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228204092 and 228204101.

It is not a weakly prime, because it can be changed into another prime (228214121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114102060 + 114102061.

It is an arithmetic number, because the mean of its divisors is an integer number (114102061).

Almost surely, 2^228204121 is an apocalyptic number.

It is an amenable number.

228204121 is a deficient number, since it is larger than the sum of its proper divisors (1).

228204121 is an equidigital number, since it uses as much as digits as its factorization.

228204121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 228204121 is about 15106.4264801441. The cubic root of 228204121 is about 611.0937297891.

Adding to 228204121 its reverse (121402822), we get a palindrome (349606943).

The spelling of 228204121 in words is "two hundred twenty-eight million, two hundred four thousand, one hundred twenty-one".