52218778121 has 2 divisors, whose sum is σ = 52218778122. Its totient is φ = 52218778120.

The previous prime is 52218777929. The next prime is 52218778147. The reversal of 52218778121 is 12187781225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27629088400 + 24589689721 = 166220^2 + 156811^2 .

It is a cyclic number.

It is not a de Polignac number, because 52218778121 - 2¹⁰ = 52218777097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (52211778121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26109389060 + 26109389061.

It is an arithmetic number, because the mean of its divisors is an integer number (26109389061).

Almost surely, 2^52218778121 is an apocalyptic number.

It is an amenable number.

52218778121 is a deficient number, since it is larger than the sum of its proper divisors (1).

52218778121 is an equidigital number, since it uses as much as digits as its factorization.

52218778121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125440, while the sum is 44.

The spelling of 52218778121 in words is "fifty-two billion, two hundred eighteen million, seven hundred seventy-eight thousand, one hundred twenty-one".