123501721273057 has 2 divisors, whose sum is σ = 123501721273058. Its totient is φ = 123501721273056.

The previous prime is 123501721273037. The next prime is 123501721273159. The reversal of 123501721273057 is 750372127105321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104002793726976 + 19498927546081 = 10198176^2 + 4415759^2 .

It is a cyclic number.

It is not a de Polignac number, because 123501721273057 - 2³⁵ = 123467361534689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123501721272998 and 123501721273016.

It is not a weakly prime, because it can be changed into another prime (123501721273037) 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 as a sum of consecutive naturals, namely, 61750860636528 + 61750860636529.

It is an arithmetic number, because the mean of its divisors is an integer number (61750860636529).

Almost surely, 2^{123501721273057} is an apocalyptic number.

It is an amenable number.

123501721273057 is a deficient number, since it is larger than the sum of its proper divisors (1).

123501721273057 is an equidigital number, since it uses as much as digits as its factorization.

123501721273057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 617400, while the sum is 46.

Adding to 123501721273057 its reverse (750372127105321), we get a palindrome (873873848378378).

The spelling of 123501721273057 in words is "one hundred twenty-three trillion, five hundred one billion, seven hundred twenty-one million, two hundred seventy-three thousand, fifty-seven".