228144421 has 4 divisors (see below), whose sum is σ = 236011500. Its totient is φ = 220277344.

The previous prime is 228144409. The next prime is 228144443. The reversal of 228144421 is 124441822.

228144421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153512100 + 74632321 = 12390^2 + 8639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228144421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228144421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228144461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3933496 + ... + 3933553.

It is an arithmetic number, because the mean of its divisors is an integer number (59002875).

Almost surely, 2^228144421 is an apocalyptic number.

It is an amenable number.

228144421 is a deficient number, since it is larger than the sum of its proper divisors (7867079).

228144421 is an equidigital number, since it uses as much as digits as its factorization.

228144421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7867078.

The product of its digits is 4096, while the sum is 28.

The square root of 228144421 is about 15104.4503706689. The cubic root of 228144421 is about 611.0404361598.

The spelling of 228144421 in words is "two hundred twenty-eight million, one hundred forty-four thousand, four hundred twenty-one".