21111005718 has 48 divisors (see below), whose sum is σ = 49913744400. Its totient is φ = 6395351040.

The previous prime is 21111005717. The next prime is 21111005731. The reversal of 21111005718 is 81750011112.

It is a junction number, because it is equal to n+sod(n) for n = 21111005691 and 21111005700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111005717) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 732118 + ... + 760406.

It is an arithmetic number, because the mean of its divisors is an integer number (1039869675).

Almost surely, 2^21111005718 is an apocalyptic number.

21111005718 is an abundant number, since it is smaller than the sum of its proper divisors (28802738682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111005718 is a wasteful number, since it uses less digits than its factorization.

21111005718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32077 (or 32074 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 27.

The spelling of 21111005718 in words is "twenty-one billion, one hundred eleven million, five thousand, seven hundred eighteen".