21001101112 has 8 divisors (see below), whose sum is σ = 39377064600. Its totient is φ = 10500550552.

The previous prime is 21001101101. The next prime is 21001101137. The reversal of 21001101112 is 21110110012.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1312568812 + ... + 1312568827.

It is an arithmetic number, because the mean of its divisors is an integer number (4922133075).

Almost surely, 2^21001101112 is an apocalyptic number.

It is an amenable number.

21001101112 is a deficient number, since it is larger than the sum of its proper divisors (18375963488).

21001101112 is a wasteful number, since it uses less digits than its factorization.

21001101112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625137645 (or 2625137641 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001101112 its reverse (21110110012), we get a palindrome (42111211124).

The spelling of 21001101112 in words is "twenty-one billion, one million, one hundred one thousand, one hundred twelve".