224128821 has 8 divisors (see below), whose sum is σ = 341529664. Its totient is φ = 128073600.

The previous prime is 224128819. The next prime is 224128831. The reversal of 224128821 is 128821422.

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

It is not a de Polignac number, because 224128821 - 2¹ = 224128819 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 (224128811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5336380 + ... + 5336421.

It is an arithmetic number, because the mean of its divisors is an integer number (42691208).

Almost surely, 2^224128821 is an apocalyptic number.

224128821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

224128821 is a deficient number, since it is larger than the sum of its proper divisors (117400843).

224128821 is a wasteful number, since it uses less digits than its factorization.

224128821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10672811.

The product of its digits is 4096, while the sum is 30.

The square root of 224128821 is about 14970.9325360847. The cubic root of 224128821 is about 607.4341936204.

The spelling of 224128821 in words is "two hundred twenty-four million, one hundred twenty-eight thousand, eight hundred twenty-one".