224100021 has 4 divisors (see below), whose sum is σ = 298800032. Its totient is φ = 149400012.

The previous prime is 224100013. The next prime is 224100043. The reversal of 224100021 is 120001422.

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 not a de Polignac number, because 224100021 - 2³ = 224100013 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 (224107021) 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 3 ways as a sum of consecutive naturals, for example, 37350001 + ... + 37350006.

It is an arithmetic number, because the mean of its divisors is an integer number (74700008).

Almost surely, 2^224100021 is an apocalyptic number.

It is an amenable number.

224100021 is a deficient number, since it is larger than the sum of its proper divisors (74700011).

224100021 is an equidigital number, since it uses as much as digits as its factorization.

224100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74700010.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 224100021 is about 14969.9706412538. The cubic root of 224100021 is about 607.4081745747.

Adding to 224100021 its reverse (120001422), we get a palindrome (344101443).

The spelling of 224100021 in words is "two hundred twenty-four million, one hundred thousand, twenty-one".