224009921 has 2 divisors, whose sum is σ = 224009922. Its totient is φ = 224009920.

The previous prime is 224009887. The next prime is 224009963. The reversal of 224009921 is 129900422.

224009921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137147521 + 86862400 = 11711^2 + 9320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-224009921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (224009971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112004960 + 112004961.

It is an arithmetic number, because the mean of its divisors is an integer number (112004961).

Almost surely, 2^224009921 is an apocalyptic number.

It is an amenable number.

224009921 is a deficient number, since it is larger than the sum of its proper divisors (1).

224009921 is an equidigital number, since it uses as much as digits as its factorization.

224009921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 224009921 is about 14966.9609807736. The cubic root of 224009921 is about 607.3267603140.

The spelling of 224009921 in words is "two hundred twenty-four million, nine thousand, nine hundred twenty-one".