421660201 has 2 divisors, whose sum is σ = 421660202. Its totient is φ = 421660200.

The previous prime is 421660199. The next prime is 421660223. The reversal of 421660201 is 102066124.

It is an a-pointer prime, because the next prime (421660223) can be obtained adding 421660201 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393824025 + 27836176 = 19845^2 + 5276^2 .

It is a cyclic number.

It is not a de Polignac number, because 421660201 - 2¹ = 421660199 is a prime.

Together with 421660199, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (421660241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210830100 + 210830101.

It is an arithmetic number, because the mean of its divisors is an integer number (210830101).

Almost surely, 2^421660201 is an apocalyptic number.

It is an amenable number.

421660201 is a deficient number, since it is larger than the sum of its proper divisors (1).

421660201 is an equidigital number, since it uses as much as digits as its factorization.

421660201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 421660201 is about 20534.3663403573. The cubic root of 421660201 is about 749.8726900945.

The spelling of 421660201 in words is "four hundred twenty-one million, six hundred sixty thousand, two hundred one".