502040221 has 4 divisors (see below), whose sum is σ = 511512732. Its totient is φ = 492567712.

The previous prime is 502040213. The next prime is 502040233. The reversal of 502040221 is 122040205.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 271425625 + 230614596 = 16475^2 + 15186^2 .

It is a cyclic number.

It is not a de Polignac number, because 502040221 - 2³ = 502040213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 502040195 and 502040204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (502040261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4736176 + ... + 4736281.

It is an arithmetic number, because the mean of its divisors is an integer number (127878183).

Almost surely, 2^502040221 is an apocalyptic number.

It is an amenable number.

502040221 is a deficient number, since it is larger than the sum of its proper divisors (9472511).

502040221 is an equidigital number, since it uses as much as digits as its factorization.

502040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9472510.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 502040221 is about 22406.2540599717. The cubic root of 502040221 is about 794.7786106110.

Subtracting from 502040221 its sum of digits (16), we obtain a palindrome (502040205).

Adding to 502040221 its reverse (122040205), we get a palindrome (624080426).

The spelling of 502040221 in words is "five hundred two million, forty thousand, two hundred twenty-one".