228035221 has 2 divisors, whose sum is σ = 228035222. Its totient is φ = 228035220.

The previous prime is 228035191. The next prime is 228035239. The reversal of 228035221 is 122530822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130302225 + 97732996 = 11415^2 + 9886^2 .

It is a cyclic number.

It is not a de Polignac number, because 228035221 - 2⁵ = 228035189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228035251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114017610 + 114017611.

It is an arithmetic number, because the mean of its divisors is an integer number (114017611).

Almost surely, 2^228035221 is an apocalyptic number.

It is an amenable number.

228035221 is a deficient number, since it is larger than the sum of its proper divisors (1).

228035221 is an equidigital number, since it uses as much as digits as its factorization.

228035221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 228035221 is about 15100.8351093574. The cubic root of 228035221 is about 610.9429302845.

The spelling of 228035221 in words is "two hundred twenty-eight million, thirty-five thousand, two hundred twenty-one".