421363555601 has 2 divisors, whose sum is σ = 421363555602. Its totient is φ = 421363555600.

The previous prime is 421363555583. The next prime is 421363555603. The reversal of 421363555601 is 106555363124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314722122001 + 106641433600 = 561001^2 + 326560^2 .

It is a cyclic number.

It is not a de Polignac number, because 421363555601 - 2²⁶ = 421296446737 is a prime.

It is a Sophie Germain prime.

Together with 421363555603, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (421363555603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210681777800 + 210681777801.

It is an arithmetic number, because the mean of its divisors is an integer number (210681777801).

Almost surely, 2^421363555601 is an apocalyptic number.

It is an amenable number.

421363555601 is a deficient number, since it is larger than the sum of its proper divisors (1).

421363555601 is an equidigital number, since it uses as much as digits as its factorization.

421363555601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 421363555601 in words is "four hundred twenty-one billion, three hundred sixty-three million, five hundred fifty-five thousand, six hundred one".