421811 has 8 divisors (see below), whose sum is σ = 461664. Its totient is φ = 383040.

The previous prime is 421807. The next prime is 421831. The reversal of 421811 is 118124.

421811 is nontrivially palindromic in base 2.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421811 - 2² = 421807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421811.

It is not an unprimeable number, because it can be changed into a prime (421801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (57708).

2⁴²¹⁸¹¹ is an apocalyptic number.

421811 is a deficient number, since it is larger than the sum of its proper divisors (39853).

421811 is a wasteful number, since it uses less digits than its factorization.

421811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541.

The product of its digits is 64, while the sum is 17.

The square root of 421811 is about 649.4697837467. The cubic root of 421811 is about 74.9962072156.

Adding to 421811 its product of digits (64), we get a cube (421875 = 75³).

Adding to 421811 its reverse (118124), we get a palindrome (539935).

The spelling of 421811 in words is "four hundred twenty-one thousand, eight hundred eleven".