228929821 has 8 divisors (see below), whose sum is σ = 233289504. Its totient is φ = 224598000.

The previous prime is 228929783. The next prime is 228929839. The reversal of 228929821 is 128929822.

228929821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 228929821 - 2¹³ = 228921629 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 (228929881) 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, 10011 + ... + 23623.

It is an arithmetic number, because the mean of its divisors is an integer number (29161188).

Almost surely, 2^228929821 is an apocalyptic number.

It is an amenable number.

228929821 is a deficient number, since it is larger than the sum of its proper divisors (4359683).

228929821 is a wasteful number, since it uses less digits than its factorization.

228929821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13931.

The product of its digits is 82944, while the sum is 43.

The square root of 228929821 is about 15130.4269933138. The cubic root of 228929821 is about 611.7408134329.

Subtracting from 228929821 its reverse (128929822), we obtain a palindrome (99999999).

The spelling of 228929821 in words is "two hundred twenty-eight million, nine hundred twenty-nine thousand, eight hundred twenty-one".