224000021 has 12 divisors (see below), whose sum is σ = 260850240. Its totient is φ = 191794680.

The previous prime is 223999903. The next prime is 224000047. The reversal of 224000021 is 120000422.

It is not a de Polignac number, because 224000021 - 2²⁶ = 156891157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 223999966 and 224000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (224000071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59876 + ... + 63506.

It is an arithmetic number, because the mean of its divisors is an integer number (21737520).

Almost surely, 2^224000021 is an apocalyptic number.

It is an amenable number.

224000021 is a deficient number, since it is larger than the sum of its proper divisors (36850219).

224000021 is a wasteful number, since it uses less digits than its factorization.

224000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4904 (or 4897 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 224000021 is about 14966.6302486565. The cubic root of 224000021 is about 607.3178133538.

Adding to 224000021 its reverse (120000422), we get a palindrome (344000443).

The spelling of 224000021 in words is "two hundred twenty-four million, twenty-one", and thus it is an aban number.