421416566201 has 2 divisors, whose sum is σ = 421416566202. Its totient is φ = 421416566200.

The previous prime is 421416566189. The next prime is 421416566203. The reversal of 421416566201 is 102665614124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418674996601 + 2741569600 = 647051^2 + 52360^2 .

It is a cyclic number.

It is not a de Polignac number, because 421416566201 - 2¹⁰ = 421416565177 is a prime.

Together with 421416566203, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421416566203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210708283100 + 210708283101.

It is an arithmetic number, because the mean of its divisors is an integer number (210708283101).

Almost surely, 2^421416566201 is an apocalyptic number.

It is an amenable number.

421416566201 is a deficient number, since it is larger than the sum of its proper divisors (1).

421416566201 is an equidigital number, since it uses as much as digits as its factorization.

421416566201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 421416566201 in words is "four hundred twenty-one billion, four hundred sixteen million, five hundred sixty-six thousand, two hundred one".