421754320601857 has 2 divisors, whose sum is σ = 421754320601858. Its totient is φ = 421754320601856.

The previous prime is 421754320601819. The next prime is 421754320601879. The reversal of 421754320601857 is 758106023457124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247040937911296 + 174713382690561 = 15717536^2 + 13217919^2 .

It is a cyclic number.

It is not a de Polignac number, because 421754320601857 - 2¹⁵ = 421754320569089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421754320601798 and 421754320601807.

It is not a weakly prime, because it can be changed into another prime (421754320661857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210877160300928 + 210877160300929.

It is an arithmetic number, because the mean of its divisors is an integer number (210877160300929).

Almost surely, 2^{421754320601857} is an apocalyptic number.

It is an amenable number.

421754320601857 is a deficient number, since it is larger than the sum of its proper divisors (1).

421754320601857 is an equidigital number, since it uses as much as digits as its factorization.

421754320601857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11289600, while the sum is 55.

The spelling of 421754320601857 in words is "four hundred twenty-one trillion, seven hundred fifty-four billion, three hundred twenty million, six hundred one thousand, eight hundred fifty-seven".