122020502521 has 4 divisors (see below), whose sum is σ = 122797703332. Its totient is φ = 121243301712.

The previous prime is 122020502491. The next prime is 122020502537. The reversal of 122020502521 is 125205020221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125205020221 = 41 ⋅3053780981.

It can be written as a sum of positive squares in 2 ways, for example, as 83948688121 + 38071814400 = 289739^2 + 195120^2 .

It is a cyclic number.

It is not a de Polignac number, because 122020502521 - 2⁷ = 122020502393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122020502492 and 122020502501.

It is not an unprimeable number, because it can be changed into a prime (122020502551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388600170 + ... + 388600483.

It is an arithmetic number, because the mean of its divisors is an integer number (30699425833).

Almost surely, 2^122020502521 is an apocalyptic number.

It is an amenable number.

122020502521 is a deficient number, since it is larger than the sum of its proper divisors (777200811).

122020502521 is an equidigital number, since it uses as much as digits as its factorization.

122020502521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777200810.

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 122020502521 its reverse (125205020221), we get a palindrome (247225522742).

The spelling of 122020502521 in words is "one hundred twenty-two billion, twenty million, five hundred two thousand, five hundred twenty-one".