501202421 has 2 divisors, whose sum is σ = 501202422. Its totient is φ = 501202420.

The previous prime is 501202399. The next prime is 501202423. The reversal of 501202421 is 124202105.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500014321 + 1188100 = 22361^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 501202421 - 2¹⁸ = 500940277 is a prime.

It is a super-2 number, since 2×501202421² = 502407733632522482, which contains 22 as substring.

Together with 501202423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 501202421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501202423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250601210 + 250601211.

It is an arithmetic number, because the mean of its divisors is an integer number (250601211).

Almost surely, 2^501202421 is an apocalyptic number.

It is an amenable number.

501202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

501202421 is an equidigital number, since it uses as much as digits as its factorization.

501202421 is an odious number, because the sum of its binary digits is odd.

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

The square root of 501202421 is about 22387.5505806240. The cubic root of 501202421 is about 794.3362580978.

Adding to 501202421 its reverse (124202105), we get a palindrome (625404526).

The spelling of 501202421 in words is "five hundred one million, two hundred two thousand, four hundred twenty-one".