21100021112 has 8 divisors (see below), whose sum is σ = 39562539600. Its totient is φ = 10550010552.

The previous prime is 21100021109. The next prime is 21100021157. The reversal of 21100021112 is 21112000112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21100021093 and 21100021102.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1318751312 + ... + 1318751327.

It is an arithmetic number, because the mean of its divisors is an integer number (4945317450).

Almost surely, 2^21100021112 is an apocalyptic number.

It is an amenable number.

21100021112 is a deficient number, since it is larger than the sum of its proper divisors (18462518488).

21100021112 is a wasteful number, since it uses less digits than its factorization.

21100021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2637502645 (or 2637502641 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21100021112 its reverse (21112000112), we get a palindrome (42212021224).

The spelling of 21100021112 in words is "twenty-one billion, one hundred million, twenty-one thousand, one hundred twelve".