21108936113 has 32 divisors (see below), whose sum is σ = 23649533952. Its totient is φ = 18770875200.

The previous prime is 21108936109. The next prime is 21108936131. The reversal of 21108936113 is 31163980112.

It is a cyclic number.

It is not a de Polignac number, because 21108936113 - 2² = 21108936109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21108936133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1864556 + ... + 1875842.

It is an arithmetic number, because the mean of its divisors is an integer number (739047936).

Almost surely, 2^21108936113 is an apocalyptic number.

21108936113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21108936113 is a deficient number, since it is larger than the sum of its proper divisors (2540597839).

21108936113 is a wasteful number, since it uses less digits than its factorization.

21108936113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11445.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 21108936113 in words is "twenty-one billion, one hundred eight million, nine hundred thirty-six thousand, one hundred thirteen".