21111005716 has 24 divisors (see below), whose sum is σ = 38900120000. Its totient is φ = 9997012224.

The previous prime is 21111005693. The next prime is 21111005717. The reversal of 21111005716 is 61750011112.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231460 + ... + 309508.

Almost surely, 2^21111005716 is an apocalyptic number.

It is an amenable number.

21111005716 is a deficient number, since it is larger than the sum of its proper divisors (17789114284).

21111005716 is a wasteful number, since it uses less digits than its factorization.

21111005716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81631 (or 81629 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 25.

Adding to 21111005716 its reverse (61750011112), we get a palindrome (82861016828).

The spelling of 21111005716 in words is "twenty-one billion, one hundred eleven million, five thousand, seven hundred sixteen".