421020535 has 16 divisors (see below), whose sum is σ = 545519520. Its totient is φ = 310089600.

The previous prime is 421020529. The next prime is 421020539. The reversal of 421020535 is 535020124.

It is not a de Polignac number, because 421020535 - 2¹⁵ = 420987767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421020539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16960 + ... + 33610.

It is an arithmetic number, because the mean of its divisors is an integer number (34094970).

Almost surely, 2^421020535 is an apocalyptic number.

421020535 is a deficient number, since it is larger than the sum of its proper divisors (124498985).

421020535 is a wasteful number, since it uses less digits than its factorization.

421020535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17058.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 421020535 is about 20518.7849299124. The cubic root of 421020535 is about 749.4933081319.

Adding to 421020535 its reverse (535020124), we get a palindrome (956040659).

The spelling of 421020535 in words is "four hundred twenty-one million, twenty thousand, five hundred thirty-five".