224104021 has 4 divisors (see below), whose sum is σ = 224896192. Its totient is φ = 223311852.

The previous prime is 224103983. The next prime is 224104033. The reversal of 224104021 is 120401422.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120401422 = 2 ⋅60200711.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-224104021 is a prime.

It is a super-2 number, since 2×224104021² = 100445224456736882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 224103986 and 224104004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224104061) 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, 395661 + ... + 396226.

It is an arithmetic number, because the mean of its divisors is an integer number (56224048).

Almost surely, 2^224104021 is an apocalyptic number.

It is an amenable number.

224104021 is a deficient number, since it is larger than the sum of its proper divisors (792171).

224104021 is an equidigital number, since it uses as much as digits as its factorization.

224104021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792170.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 224104021 is about 14970.1042414540. The cubic root of 224104021 is about 607.4117884643.

Adding to 224104021 its reverse (120401422), we get a palindrome (344505443).

The spelling of 224104021 in words is "two hundred twenty-four million, one hundred four thousand, twenty-one".