21101715112 has 16 divisors (see below), whose sum is σ = 39597412500. Its totient is φ = 10542405120.

The previous prime is 21101715109. The next prime is 21101715113. The reversal of 21101715112 is 21151710112.

It can be written as a sum of positive squares in 2 ways, for example, as 20945615076 + 156100036 = 144726^2 + 12494^2 .

It is not an unprimeable number, because it can be changed into a prime (21101715113) 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 3 ways as a sum of consecutive naturals, for example, 1045939 + ... + 1065922.

Almost surely, 2^21101715112 is an apocalyptic number.

It is an amenable number.

21101715112 is a deficient number, since it is larger than the sum of its proper divisors (18495697388).

21101715112 is a wasteful number, since it uses less digits than its factorization.

21101715112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113116 (or 2113112 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 22.

Multiplying 21101715112 by its sum of digits (22), we get a palindrome (464237732464).

Subtracting 21101715112 from its reverse (21151710112), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 21101715112 in words is "twenty-one billion, one hundred one million, seven hundred fifteen thousand, one hundred twelve".