43111123555521 has 32 divisors (see below), whose sum is σ = 69488396605440. Its totient is φ = 23241051529344.

The previous prime is 43111123555481. The next prime is 43111123555523. The reversal of 43111123555521 is 12555532111134.

It is not a de Polignac number, because 43111123555521 - 2⁹ = 43111123555009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43111123555521.

It is not an unprimeable number, because it can be changed into a prime (43111123555523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 611313951 + ... + 611384468.

It is an arithmetic number, because the mean of its divisors is an integer number (2171512393920).

Almost surely, 2^{43111123555521} is an apocalyptic number.

It is an amenable number.

43111123555521 is a deficient number, since it is larger than the sum of its proper divisors (26377273049919).

43111123555521 is a wasteful number, since it uses less digits than its factorization.

43111123555521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222698525.

The product of its digits is 90000, while the sum is 39.

Adding to 43111123555521 its reverse (12555532111134), we get a palindrome (55666655666655).

The spelling of 43111123555521 in words is "forty-three trillion, one hundred eleven billion, one hundred twenty-three million, five hundred fifty-five thousand, five hundred twenty-one".