505012021 has 2 divisors, whose sum is σ = 505012022. Its totient is φ = 505012020.

The previous prime is 505011953. The next prime is 505012091. The reversal of 505012021 is 120210505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504227025 + 784996 = 22455^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 505012021 - 2⁷ = 505011893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 505011986 and 505012004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505012091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252506010 + 252506011.

It is an arithmetic number, because the mean of its divisors is an integer number (252506011).

Almost surely, 2^505012021 is an apocalyptic number.

It is an amenable number.

505012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

505012021 is an equidigital number, since it uses as much as digits as its factorization.

505012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 505012021 is about 22472.4725163921. The cubic root of 505012021 is about 796.3437427903.

Adding to 505012021 its reverse (120210505), we get a palindrome (625222526).

It can be divided in two parts, 5050 and 12021, that added together give a palindrome (17071).

The spelling of 505012021 in words is "five hundred five million, twelve thousand, twenty-one".