505440122021 has 2 divisors, whose sum is σ = 505440122022. Its totient is φ = 505440122020.

The previous prime is 505440121999. The next prime is 505440122027. The reversal of 505440122021 is 120221044505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478706236996 + 26733885025 = 691886^2 + 163505^2 .

It is a cyclic number.

It is not a de Polignac number, because 505440122021 - 2³⁰ = 504366380197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505440122027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252720061010 + 252720061011.

It is an arithmetic number, because the mean of its divisors is an integer number (252720061011).

Almost surely, 2^505440122021 is an apocalyptic number.

It is an amenable number.

505440122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

505440122021 is an equidigital number, since it uses as much as digits as its factorization.

505440122021 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 26.

Adding to 505440122021 its reverse (120221044505), we get a palindrome (625661166526).

The spelling of 505440122021 in words is "five hundred five billion, four hundred forty million, one hundred twenty-two thousand, twenty-one".