228162421 has 2 divisors, whose sum is σ = 228162422. Its totient is φ = 228162420.

The previous prime is 228162419. The next prime is 228162437. The reversal of 228162421 is 124261822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175032900 + 53129521 = 13230^2 + 7289^2 .

It is a cyclic number.

It is not a de Polignac number, because 228162421 - 2¹ = 228162419 is a prime.

It is a super-3 number, since 3×228162421³ (a number of 26 digits) contains 333 as substring.

Together with 228162419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 228162421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228162521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114081210 + 114081211.

It is an arithmetic number, because the mean of its divisors is an integer number (114081211).

Almost surely, 2^228162421 is an apocalyptic number.

It is an amenable number.

228162421 is a deficient number, since it is larger than the sum of its proper divisors (1).

228162421 is an equidigital number, since it uses as much as digits as its factorization.

228162421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 28.

The square root of 228162421 is about 15105.0462097936. The cubic root of 228162421 is about 611.0565055696.

The spelling of 228162421 in words is "two hundred twenty-eight million, one hundred sixty-two thousand, four hundred twenty-one".