224428921 has 8 divisors (see below), whose sum is σ = 226606464. Its totient is φ = 222261840.

The previous prime is 224428909. The next prime is 224428949. The reversal of 224428921 is 129824422.

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 224428921 - 2¹⁵ = 224396153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (224428991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44490 + ... + 49276.

It is an arithmetic number, because the mean of its divisors is an integer number (28325808).

Almost surely, 2^224428921 is an apocalyptic number.

It is an amenable number.

224428921 is a deficient number, since it is larger than the sum of its proper divisors (2177543).

224428921 is a wasteful number, since it uses less digits than its factorization.

224428921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5231.

The product of its digits is 18432, while the sum is 34.

The square root of 224428921 is about 14980.9519390458. The cubic root of 224428921 is about 607.7051831655.

The spelling of 224428921 in words is "two hundred twenty-four million, four hundred twenty-eight thousand, nine hundred twenty-one".