501243322421 has 2 divisors, whose sum is σ = 501243322422. Its totient is φ = 501243322420.

The previous prime is 501243322403. The next prime is 501243322441. The reversal of 501243322421 is 124223342105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345150375025 + 156092947396 = 587495^2 + 395086^2 .

It is a cyclic number.

It is not a de Polignac number, because 501243322421 - 2⁶ = 501243322357 is a prime.

It is a super-2 number, since 2×501243322421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501243322441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250621661210 + 250621661211.

It is an arithmetic number, because the mean of its divisors is an integer number (250621661211).

Almost surely, 2^501243322421 is an apocalyptic number.

It is an amenable number.

501243322421 is a deficient number, since it is larger than the sum of its proper divisors (1).

501243322421 is an equidigital number, since it uses as much as digits as its factorization.

501243322421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 501243322421 its reverse (124223342105), we get a palindrome (625466664526).

The spelling of 501243322421 in words is "five hundred one billion, two hundred forty-three million, three hundred twenty-two thousand, four hundred twenty-one".