228351421 has 2 divisors, whose sum is σ = 228351422. Its totient is φ = 228351420.

The previous prime is 228351419. The next prime is 228351433. The reversal of 228351421 is 124153822.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226352025 + 1999396 = 15045^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 228351421 - 2¹ = 228351419 is a prime.

Together with 228351419, 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 228351421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (228351491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114175710 + 114175711.

It is an arithmetic number, because the mean of its divisors is an integer number (114175711).

Almost surely, 2^228351421 is an apocalyptic number.

It is an amenable number.

228351421 is a deficient number, since it is larger than the sum of its proper divisors (1).

228351421 is an equidigital number, since it uses as much as digits as its factorization.

228351421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 228351421 is about 15111.3011021553. The cubic root of 228351421 is about 611.2251833691.

It can be divided in two parts, 228 and 351421, that added together give a square (351649 = 593²).

The spelling of 228351421 in words is "two hundred twenty-eight million, three hundred fifty-one thousand, four hundred twenty-one".