21111616723 has 8 divisors (see below), whose sum is σ = 21641920848. Its totient is φ = 20586200544.

The previous prime is 21111616711. The next prime is 21111616783. The reversal of 21111616723 is 32761611112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111616723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111616783) 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, 1213240 + ... + 1230517.

It is an arithmetic number, because the mean of its divisors is an integer number (2705240106).

Almost surely, 2^21111616723 is an apocalyptic number.

21111616723 is a deficient number, since it is larger than the sum of its proper divisors (530304125).

21111616723 is a wasteful number, since it uses less digits than its factorization.

21111616723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443973.

The product of its digits is 3024, while the sum is 31.

The spelling of 21111616723 in words is "twenty-one billion, one hundred eleven million, six hundred sixteen thousand, seven hundred twenty-three".