421801 has 2 divisors, whose sum is σ = 421802. Its totient is φ = 421800.

The previous prime is 421783. The next prime is 421807. The reversal of 421801 is 108124.

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., 416025 + 5776 = 645^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 421801 - 2¹¹ = 419753 is a prime.

It is not a weakly prime, because it can be changed into another prime (421807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210900 + 210901.

It is an arithmetic number, because the mean of its divisors is an integer number (210901).

2⁴²¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

421801 is a deficient number, since it is larger than the sum of its proper divisors (1).

421801 is an equidigital number, since it uses as much as digits as its factorization.

421801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 421801 is about 649.4620851135. The cubic root of 421801 is about 74.9956145584.

Adding to 421801 its reverse (108124), we get a palindrome (529925).

The spelling of 421801 in words is "four hundred twenty-one thousand, eight hundred one".