228630221 has 2 divisors, whose sum is σ = 228630222. Its totient is φ = 228630220.

The previous prime is 228630209. The next prime is 228630271. The reversal of 228630221 is 122036822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224670121 + 3960100 = 14989^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 228630221 - 2¹⁴ = 228613837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228630271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114315110 + 114315111.

It is an arithmetic number, because the mean of its divisors is an integer number (114315111).

Almost surely, 2^228630221 is an apocalyptic number.

It is an amenable number.

228630221 is a deficient number, since it is larger than the sum of its proper divisors (1).

228630221 is an equidigital number, since it uses as much as digits as its factorization.

228630221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 228630221 is about 15120.5231721657. The cubic root of 228630221 is about 611.4738356072.

The spelling of 228630221 in words is "two hundred twenty-eight million, six hundred thirty thousand, two hundred twenty-one".