436344320821 has 2 divisors, whose sum is σ = 436344320822. Its totient is φ = 436344320820.

The previous prime is 436344320791. The next prime is 436344320833. The reversal of 436344320821 is 128023443634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421947680625 + 14396640196 = 649575^2 + 119986^2 .

It is a cyclic number.

It is not a de Polignac number, because 436344320821 - 2⁹ = 436344320309 is a prime.

It is a super-2 number, since 2×436344320821² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (436344320021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 218172160410 + 218172160411.

It is an arithmetic number, because the mean of its divisors is an integer number (218172160411).

Almost surely, 2^436344320821 is an apocalyptic number.

It is an amenable number.

436344320821 is a deficient number, since it is larger than the sum of its proper divisors (1).

436344320821 is an equidigital number, since it uses as much as digits as its factorization.

436344320821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 40.

The spelling of 436344320821 in words is "four hundred thirty-six billion, three hundred forty-four million, three hundred twenty thousand, eight hundred twenty-one".