228441921 has 16 divisors (see below), whose sum is σ = 322314240. Its totient is φ = 143516880.

The previous prime is 228441919. The next prime is 228441931. The reversal of 228441921 is 129144822.

It is not a de Polignac number, because 228441921 - 2¹ = 228441919 is a prime.

It is a super-2 number, since 2×228441921² = 104371422540340482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228441931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396 + ... + 21378.

It is an arithmetic number, because the mean of its divisors is an integer number (20144640).

Almost surely, 2^228441921 is an apocalyptic number.

It is an amenable number.

228441921 is a deficient number, since it is larger than the sum of its proper divisors (93872319).

228441921 is a wasteful number, since it uses less digits than its factorization.

228441921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21196.

The product of its digits is 9216, while the sum is 33.

The square root of 228441921 is about 15114.2952531701. The cubic root of 228441921 is about 611.3059194161.

The spelling of 228441921 in words is "two hundred twenty-eight million, four hundred forty-one thousand, nine hundred twenty-one".