121355325513 has 24 divisors (see below), whose sum is σ = 181352363400. Its totient is φ = 78106527744.

The previous prime is 121355325499. The next prime is 121355325517. The reversal of 121355325513 is 315523553121.

121355325513 is a `hidden beast` number, since 1 + 2 + 135 + 5 + 3 + 2 + 5 + 513 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2328255504 + 119027070009 = 48252^2 + 345003^2 .

It is not a de Polignac number, because 121355325513 - 2⁸ = 121355325257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121355325517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5615593 + ... + 5637161.

It is an arithmetic number, because the mean of its divisors is an integer number (7556348475).

Almost surely, 2^121355325513 is an apocalyptic number.

It is an amenable number.

121355325513 is a deficient number, since it is larger than the sum of its proper divisors (59997037887).

121355325513 is a wasteful number, since it uses less digits than its factorization.

121355325513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43161 (or 43158 counting only the distinct ones).

The product of its digits is 67500, while the sum is 36.

Adding to 121355325513 its reverse (315523553121), we get a palindrome (436878878634).

The spelling of 121355325513 in words is "one hundred twenty-one billion, three hundred fifty-five million, three hundred twenty-five thousand, five hundred thirteen".