1205121140523 has 12 divisors (see below), whose sum is σ = 1740805481688. Its totient is φ = 803379503520.

The previous prime is 1205121140473. The next prime is 1205121140551. The reversal of 1205121140523 is 3250411215021.

It is a happy number.

1205121140523 is a `hidden beast` number, since 1 + 2 + 0 + 5 + 121 + 14 + 0 + 523 = 666.

It is not a de Polignac number, because 1205121140523 - 2⁶ = 1205121140459 is a prime.

It is a super-4 number, since 4×1205121140523⁴ (a number of 49 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (1205121140563) 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 in 11 ways as a sum of consecutive naturals, for example, 2660965 + ... + 3080742.

It is an arithmetic number, because the mean of its divisors is an integer number (145067123474).

Almost surely, 2^{1205121140523} is an apocalyptic number.

1205121140523 is a deficient number, since it is larger than the sum of its proper divisors (535684341165).

1205121140523 is a wasteful number, since it uses less digits than its factorization.

1205121140523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5765034 (or 5765031 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 1205121140523 its reverse (3250411215021), we get a palindrome (4455532355544).

The spelling of 1205121140523 in words is "one trillion, two hundred five billion, one hundred twenty-one million, one hundred forty thousand, five hundred twenty-three".