228743347821 has 32 divisors (see below), whose sum is σ = 318258892800. Its totient is φ = 145955335680.

The previous prime is 228743347783. The next prime is 228743347837. The reversal of 228743347821 is 128743347822.

It is not a de Polignac number, because 228743347821 - 2⁶ = 228743347757 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228743347871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14234131 + ... + 14250191.

It is an arithmetic number, because the mean of its divisors is an integer number (9945590400).

Almost surely, 2^228743347821 is an apocalyptic number.

It is an amenable number.

228743347821 is a deficient number, since it is larger than the sum of its proper divisors (89515544979).

228743347821 is a wasteful number, since it uses less digits than its factorization.

228743347821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17509.

The product of its digits is 3612672, while the sum is 51.

Subtracting from 228743347821 its reverse (128743347822), we obtain a palindrome (99999999999).

The spelling of 228743347821 in words is "two hundred twenty-eight billion, seven hundred forty-three million, three hundred forty-seven thousand, eight hundred twenty-one".