501421 has 4 divisors (see below), whose sum is σ = 503100. Its totient is φ = 499744.

The previous prime is 501419. The next prime is 501427. The reversal of 501421 is 124105.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124105 = 5 ⋅24821.

It can be written as a sum of positive squares in 2 ways, for example, as 265225 + 236196 = 515^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 501421 - 2¹ = 501419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256 + ... + 1033.

It is an arithmetic number, because the mean of its divisors is an integer number (125775).

2⁵⁰¹⁴²¹ is an apocalyptic number.

It is an amenable number.

501421 is a deficient number, since it is larger than the sum of its proper divisors (1679).

501421 is a wasteful number, since it uses less digits than its factorization.

501421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 501421 is about 708.1108670258. The cubic root of 501421 is about 79.4451713773.

Adding to 501421 its reverse (124105), we get a palindrome (625526).

The spelling of 501421 in words is "five hundred one thousand, four hundred twenty-one".