122543120221 has 2 divisors, whose sum is σ = 122543120222. Its totient is φ = 122543120220.

The previous prime is 122543120207. The next prime is 122543120237. The reversal of 122543120221 is 122021345221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95938248121 + 26604872100 = 309739^2 + 163110^2 .

It is a cyclic number.

It is not a de Polignac number, because 122543120221 - 2²¹ = 122541023069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122543120201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61271560110 + 61271560111.

It is an arithmetic number, because the mean of its divisors is an integer number (61271560111).

Almost surely, 2^122543120221 is an apocalyptic number.

It is an amenable number.

122543120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

122543120221 is an equidigital number, since it uses as much as digits as its factorization.

122543120221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 122543120221 its reverse (122021345221), we get a palindrome (244564465442).

The spelling of 122543120221 in words is "one hundred twenty-two billion, five hundred forty-three million, one hundred twenty thousand, two hundred twenty-one".