21111052325505 has 16 divisors (see below), whose sum is σ = 34350186836160. Its totient is φ = 11068393535168.

The previous prime is 21111052325459. The next prime is 21111052325521. The reversal of 21111052325505 is 50552325011112.

It is a cyclic number.

It is not a de Polignac number, because 21111052325505 - 2²⁰ = 21111051276929 is a prime.

It is an unprimeable number.

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, 11927147322 + ... + 11927149091.

It is an arithmetic number, because the mean of its divisors is an integer number (2146886677260).

Almost surely, 2^{21111052325505} is an apocalyptic number.

It is an amenable number.

21111052325505 is a deficient number, since it is larger than the sum of its proper divisors (13239134510655).

21111052325505 is a wasteful number, since it uses less digits than its factorization.

21111052325505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23854296480.

The product of its (nonzero) digits is 15000, while the sum is 33.

Adding to 21111052325505 its reverse (50552325011112), we get a palindrome (71663377336617).

The spelling of 21111052325505 in words is "twenty-one trillion, one hundred eleven billion, fifty-two million, three hundred twenty-five thousand, five hundred five".