224446405636721 has 2 divisors, whose sum is σ = 224446405636722. Its totient is φ = 224446405636720.

The previous prime is 224446405636709. The next prime is 224446405636769. The reversal of 224446405636721 is 127636504644422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224375683680625 + 70721956096 = 14979175^2 + 265936^2 .

It is a cyclic number.

It is not a de Polignac number, because 224446405636721 - 2³⁸ = 224171527729777 is a prime.

It is not a weakly prime, because it can be changed into another prime (224446405636781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112223202818360 + 112223202818361.

It is an arithmetic number, because the mean of its divisors is an integer number (112223202818361).

Almost surely, 2^{224446405636721} is an apocalyptic number.

It is an amenable number.

224446405636721 is a deficient number, since it is larger than the sum of its proper divisors (1).

224446405636721 is an equidigital number, since it uses as much as digits as its factorization.

224446405636721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46448640, while the sum is 56.

The spelling of 224446405636721 in words is "two hundred twenty-four trillion, four hundred forty-six billion, four hundred five million, six hundred thirty-six thousand, seven hundred twenty-one".