1305550023121 has 4 divisors (see below), whose sum is σ = 1306744489012. Its totient is φ = 1304355557232.

The previous prime is 1305550023101. The next prime is 1305550023139. The reversal of 1305550023121 is 1213200555031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 875555075521 + 429994947600 = 935711^2 + 655740^2 .

It is a cyclic number.

It is not a de Polignac number, because 1305550023121 - 2¹¹ = 1305550021073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1305550023121.

It is not an unprimeable number, because it can be changed into a prime (1305550023101) 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, 597231306 + ... + 597233491.

It is an arithmetic number, because the mean of its divisors is an integer number (326686122253).

Almost surely, 2^{1305550023121} is an apocalyptic number.

It is an amenable number.

1305550023121 is a deficient number, since it is larger than the sum of its proper divisors (1194465891).

1305550023121 is a wasteful number, since it uses less digits than its factorization.

1305550023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194465890.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 1305550023121 its reverse (1213200555031), we get a palindrome (2518750578152).

The spelling of 1305550023121 in words is "one trillion, three hundred five billion, five hundred fifty million, twenty-three thousand, one hundred twenty-one".