21021100112 has 20 divisors (see below), whose sum is σ = 40761721440. Its totient is φ = 10501946208.

The previous prime is 21021100073. The next prime is 21021100127. The reversal of 21021100112 is 21100112012.

It is a junction number, because it is equal to n+sod(n) for n = 21021100093 and 21021100102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517562 + ... + 556697.

It is an arithmetic number, because the mean of its divisors is an integer number (2038086072).

Almost surely, 2^21021100112 is an apocalyptic number.

It is an amenable number.

21021100112 is a deficient number, since it is larger than the sum of its proper divisors (19740621328).

21021100112 is a wasteful number, since it uses less digits than its factorization.

21021100112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075490 (or 1075484 counting only the distinct ones).

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

Adding to 21021100112 its reverse (21100112012), we get a palindrome (42121212124).

The spelling of 21021100112 in words is "twenty-one billion, twenty-one million, one hundred thousand, one hundred twelve".