421533 has 12 divisors (see below), whose sum is σ = 695968. Its totient is φ = 240840.

The previous prime is 421517. The next prime is 421559. The reversal of 421533 is 335124.

It is not a de Polignac number, because 421533 - 2⁴ = 421517 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3283 + ... + 3408.

2⁴²¹⁵³³ is an apocalyptic number.

It is an amenable number.

421533 is a deficient number, since it is larger than the sum of its proper divisors (274435).

421533 is a wasteful number, since it uses less digits than its factorization.

421533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704 (or 6701 counting only the distinct ones).

The product of its digits is 360, while the sum is 18.

The square root of 421533 is about 649.2557277375. The cubic root of 421533 is about 74.9797278544.

Adding to 421533 its reverse (335124), we get a palindrome (756657).

The spelling of 421533 in words is "four hundred twenty-one thousand, five hundred thirty-three".