520222121 has 2 divisors, whose sum is σ = 520222122. Its totient is φ = 520222120.

The previous prime is 520222111. The next prime is 520222141. The reversal of 520222121 is 121222025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519338521 + 883600 = 22789^2 + 940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520222121 is a prime.

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 520222121.

It is not a weakly prime, because it can be changed into another prime (520222111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260111060 + 260111061.

It is an arithmetic number, because the mean of its divisors is an integer number (260111061).

Almost surely, 2^520222121 is an apocalyptic number.

It is an amenable number.

520222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

520222121 is an equidigital number, since it uses as much as digits as its factorization.

520222121 is an evil number, because the sum of its binary digits is even.

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

The square root of 520222121 is about 22808.3783071046. The cubic root of 520222121 is about 804.2596338324.

Adding to 520222121 its reverse (121222025), we get a palindrome (641444146).

The spelling of 520222121 in words is "five hundred twenty million, two hundred twenty-two thousand, one hundred twenty-one".