21116500061534 has 12 divisors (see below), whose sum is σ = 31702249506096. Its totient is φ = 10549091503872.

The previous prime is 21116500061533. The next prime is 21116500061543. The reversal of 21116500061534 is 43516000561112.

It is a junction number, because it is equal to n+sod(n) for n = 21116500061494 and 21116500061503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116500061533) 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 5 ways as a sum of consecutive naturals, for example, 1312214 + ... + 6629849.

It is an arithmetic number, because the mean of its divisors is an integer number (2641854125508).

Almost surely, 2^{21116500061534} is an apocalyptic number.

21116500061534 is a deficient number, since it is larger than the sum of its proper divisors (10585749444562).

21116500061534 is an frugal number, since it uses more digits than its factorization.

21116500061534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7944371 (or 7943218 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 21116500061534 in words is "twenty-one trillion, one hundred sixteen billion, five hundred million, sixty-one thousand, five hundred thirty-four".