228476021 has 4 divisors (see below), whose sum is σ = 228728832. Its totient is φ = 228223212.

The previous prime is 228476011. The next prime is 228476029. The reversal of 228476021 is 120674822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228476021 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 (228476029) 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, 125045 + ... + 126858.

It is an arithmetic number, because the mean of its divisors is an integer number (57182208).

Almost surely, 2^228476021 is an apocalyptic number.

It is an amenable number.

228476021 is a deficient number, since it is larger than the sum of its proper divisors (252811).

228476021 is an equidigital number, since it uses as much as digits as its factorization.

228476021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252810.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 228476021 is about 15115.4232821976. The cubic root of 228476021 is about 611.3363348708.

The spelling of 228476021 in words is "two hundred twenty-eight million, four hundred seventy-six thousand, twenty-one".