43121355513 has 16 divisors (see below), whose sum is σ = 60526382400. Its totient is φ = 27232208640.

The previous prime is 43121355463. The next prime is 43121355521. The reversal of 43121355513 is 31555312134.

It is not a de Polignac number, because 43121355513 - 2¹⁶ = 43121289977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43121355583) 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 15 ways as a sum of consecutive naturals, for example, 846733 + ... + 896213.

It is an arithmetic number, because the mean of its divisors is an integer number (3782898900).

Almost surely, 2^43121355513 is an apocalyptic number.

It is an amenable number.

43121355513 is a deficient number, since it is larger than the sum of its proper divisors (17405026887).

43121355513 is a wasteful number, since it uses less digits than its factorization.

43121355513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64792.

The product of its digits is 27000, while the sum is 33.

Adding to 43121355513 its reverse (31555312134), we get a palindrome (74676667647).

The spelling of 43121355513 in words is "forty-three billion, one hundred twenty-one million, three hundred fifty-five thousand, five hundred thirteen".