21100946689 has 16 divisors (see below), whose sum is σ = 21492864000. Its totient is φ = 20712519360.

The previous prime is 21100946687. The next prime is 21100946747. The reversal of 21100946689 is 98664900112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21100946689 - 2¹ = 21100946687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100946687) 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 15 ways as a sum of consecutive naturals, for example, 15278779 + ... + 15280159.

It is an arithmetic number, because the mean of its divisors is an integer number (1343304000).

Almost surely, 2^21100946689 is an apocalyptic number.

It is an amenable number.

21100946689 is a deficient number, since it is larger than the sum of its proper divisors (391917311).

21100946689 is a wasteful number, since it uses less digits than its factorization.

21100946689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 21100946689 in words is "twenty-one billion, one hundred million, nine hundred forty-six thousand, six hundred eighty-nine".