504402421 has 2 divisors, whose sum is σ = 504402422. Its totient is φ = 504402420.

The previous prime is 504402413. The next prime is 504402467. The reversal of 504402421 is 124204405.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296321796 + 208080625 = 17214^2 + 14425^2 .

It is a cyclic number.

It is not a de Polignac number, because 504402421 - 2³ = 504402413 is a prime.

It is a super-2 number, since 2×504402421² = 508843604621322482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 504402392 and 504402401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (504402401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252201210 + 252201211.

It is an arithmetic number, because the mean of its divisors is an integer number (252201211).

Almost surely, 2^504402421 is an apocalyptic number.

It is an amenable number.

504402421 is a deficient number, since it is larger than the sum of its proper divisors (1).

504402421 is an equidigital number, since it uses as much as digits as its factorization.

504402421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 504402421 is about 22458.9051603145. The cubic root of 504402421 is about 796.0231916048.

Adding to 504402421 its reverse (124204405), we get a palindrome (628606826).

The spelling of 504402421 in words is "five hundred four million, four hundred two thousand, four hundred twenty-one".