21100736723 has 8 divisors (see below), whose sum is σ = 23362553280. Its totient is φ = 18896181480.

The previous prime is 21100736717. The next prime is 21100736731. The reversal of 21100736723 is 32763700112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21100736723 - 2⁸ = 21100736467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21100736723.

It is not an unprimeable number, because it can be changed into a prime (21100736743) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14314553 + ... + 14316026.

It is an arithmetic number, because the mean of its divisors is an integer number (2920319160).

Almost surely, 2^21100736723 is an apocalyptic number.

21100736723 is a deficient number, since it is larger than the sum of its proper divisors (2261816557).

21100736723 is a wasteful number, since it uses less digits than its factorization.

21100736723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28630657.

The product of its (nonzero) digits is 10584, while the sum is 32.

The spelling of 21100736723 in words is "twenty-one billion, one hundred million, seven hundred thirty-six thousand, seven hundred twenty-three".