228010121 has 2 divisors, whose sum is σ = 228010122. Its totient is φ = 228010120.

The previous prime is 228010099. The next prime is 228010147. The reversal of 228010121 is 121010822.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228010000 + 121 = 15100^2 + 11^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228010121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 228010121.

It is not a weakly prime, because it can be changed into another prime (228010721) 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 as a sum of consecutive naturals, namely, 114005060 + 114005061.

It is an arithmetic number, because the mean of its divisors is an integer number (114005061).

Almost surely, 2^228010121 is an apocalyptic number.

It is an amenable number.

228010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

228010121 is an equidigital number, since it uses as much as digits as its factorization.

228010121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 228010121 is about 15100.0040066220. The cubic root of 228010121 is about 610.9205138201.

Adding to 228010121 its reverse (121010822), we get a palindrome (349020943).

The spelling of 228010121 in words is "two hundred twenty-eight million, ten thousand, one hundred twenty-one".