500221421 has 4 divisors (see below), whose sum is σ = 571681632. Its totient is φ = 428761212.

The previous prime is 500221399. The next prime is 500221429. The reversal of 500221421 is 124122005.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 500221421 - 2⁶ = 500221357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 500221421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500221429) 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, 35730095 + ... + 35730108.

It is an arithmetic number, because the mean of its divisors is an integer number (142920408).

Almost surely, 2^500221421 is an apocalyptic number.

It is an amenable number.

500221421 is a deficient number, since it is larger than the sum of its proper divisors (71460211).

500221421 is an equidigital number, since it uses as much as digits as its factorization.

500221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71460210.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 500221421 is about 22365.6303510543. The cubic root of 500221421 is about 793.8176700031.

Adding to 500221421 its reverse (124122005), we get a palindrome (624343426).

The spelling of 500221421 in words is "five hundred million, two hundred twenty-one thousand, four hundred twenty-one".