228247421 has 8 divisors (see below), whose sum is σ = 235171704. Its totient is φ = 221425920.

The previous prime is 228247391. The next prime is 228247447. The reversal of 228247421 is 124742822.

It can be written as a sum of positive squares in 4 ways, for example, as 3667225 + 224580196 = 1915^2 + 14986^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228247421 - 2²⁶ = 161138557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228247471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21176 + ... + 30081.

It is an arithmetic number, because the mean of its divisors is an integer number (29396463).

Almost surely, 2^228247421 is an apocalyptic number.

It is an amenable number.

228247421 is a deficient number, since it is larger than the sum of its proper divisors (6924283).

228247421 is an equidigital number, since it uses as much as digits as its factorization.

228247421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51391.

The product of its digits is 14336, while the sum is 32.

The square root of 228247421 is about 15107.8595770546. The cubic root of 228247421 is about 611.1323774773.

The spelling of 228247421 in words is "two hundred twenty-eight million, two hundred forty-seven thousand, four hundred twenty-one".