21116022520505 has 32 divisors (see below), whose sum is σ = 28410456907008. Its totient is φ = 14931228614400.

The previous prime is 21116022520501. The next prime is 21116022520543. The reversal of 21116022520505 is 50502522061112.

It is a happy number.

It is not a de Polignac number, because 21116022520505 - 2² = 21116022520501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21116022520501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 946517 + ... + 6567186.

It is an arithmetic number, because the mean of its divisors is an integer number (887826778344).

Almost surely, 2^{21116022520505} is an apocalyptic number.

It is an amenable number.

21116022520505 is a deficient number, since it is larger than the sum of its proper divisors (7294434386503).

21116022520505 is a wasteful number, since it uses less digits than its factorization.

21116022520505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7515137.

The product of its (nonzero) digits is 12000, while the sum is 32.

Adding to 21116022520505 its reverse (50502522061112), we get a palindrome (71618544581617).

The spelling of 21116022520505 in words is "twenty-one trillion, one hundred sixteen billion, twenty-two million, five hundred twenty thousand, five hundred five".