502421 has 2 divisors, whose sum is σ = 502422. Its totient is φ = 502420.

The previous prime is 502409. The next prime is 502429. The reversal of 502421 is 124205.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372100 + 130321 = 610^2 + 361^2 .

It is a cyclic number.

It is not a de Polignac number, because 502421 - 2¹⁴ = 486037 is a prime.

It is a super-2 number, since 2×502421² = 504853722482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 502396 and 502405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (502429) 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, 251210 + 251211.

It is an arithmetic number, because the mean of its divisors is an integer number (251211).

2⁵⁰²⁴²¹ is an apocalyptic number.

It is an amenable number.

502421 is a deficient number, since it is larger than the sum of its proper divisors (1).

502421 is an equidigital number, since it uses as much as digits as its factorization.

502421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 502421 is about 708.8166194440. The cubic root of 502421 is about 79.4979496590.

Adding to 502421 its reverse (124205), we get a palindrome (626626).

The spelling of 502421 in words is "five hundred two thousand, four hundred twenty-one".