421081 has 2 divisors, whose sum is σ = 421082. Its totient is φ = 421080.

The previous prime is 421079. The next prime is 421093. The reversal of 421081 is 180124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 336400 + 84681 = 580^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 421081 - 2¹ = 421079 is a prime.

It is a super-2 number, since 2×421081² = 354618417122, which contains 22 as substring.

Together with 421079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (421181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210540 + 210541.

It is an arithmetic number, because the mean of its divisors is an integer number (210541).

2⁴²¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

421081 is a deficient number, since it is larger than the sum of its proper divisors (1).

421081 is an equidigital number, since it uses as much as digits as its factorization.

421081 is an odious number, because the sum of its binary digits is odd.

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

The square root of 421081 is about 648.9075434914. The cubic root of 421081 is about 74.9529185989.

The spelling of 421081 in words is "four hundred twenty-one thousand, eighty-one".