505201140210421 has 2 divisors, whose sum is σ = 505201140210422. Its totient is φ = 505201140210420.

The previous prime is 505201140210379. The next prime is 505201140210427. The reversal of 505201140210421 is 124012041102505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 503839750640625 + 1361389569796 = 22446375^2 + 1166786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505201140210421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505201140210421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505201140210427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252600570105210 + 252600570105211.

It is an arithmetic number, because the mean of its divisors is an integer number (252600570105211).

Almost surely, 2^{505201140210421} is an apocalyptic number.

It is an amenable number.

505201140210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

505201140210421 is an equidigital number, since it uses as much as digits as its factorization.

505201140210421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 505201140210421 its reverse (124012041102505), we get a palindrome (629213181312926).

The spelling of 505201140210421 in words is "five hundred five trillion, two hundred one billion, one hundred forty million, two hundred ten thousand, four hundred twenty-one".