55123450121 has 2 divisors, whose sum is σ = 55123450122. Its totient is φ = 55123450120.

The previous prime is 55123450069. The next prime is 55123450133. The reversal of 55123450121 is 12105432155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44600793721 + 10522656400 = 211189^2 + 102580^2 .

It is a cyclic number.

It is not a de Polignac number, because 55123450121 - 2²⁶ = 55056341257 is a prime.

It is not a weakly prime, because it can be changed into another prime (55123450171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27561725060 + 27561725061.

It is an arithmetic number, because the mean of its divisors is an integer number (27561725061).

Almost surely, 2^55123450121 is an apocalyptic number.

It is an amenable number.

55123450121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55123450121 is an equidigital number, since it uses as much as digits as its factorization.

55123450121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 55123450121 its reverse (12105432155), we get a palindrome (67228882276).

The spelling of 55123450121 in words is "fifty-five billion, one hundred twenty-three million, four hundred fifty thousand, one hundred twenty-one".