21001122112 has 28 divisors (see below), whose sum is σ = 43018431616. Its totient is φ = 10161832320.

The previous prime is 21001122073. The next prime is 21001122173. The reversal of 21001122112 is 21122110012.

It is a junction number, because it is equal to n+sod(n) for n = 21001122092 and 21001122101.

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, 5290638 + ... + 5294605.

Almost surely, 2^21001122112 is an apocalyptic number.

It is an amenable number.

21001122112 is an abundant number, since it is smaller than the sum of its proper divisors (22017309504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001122112 is a wasteful number, since it uses less digits than its factorization.

21001122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10585286 (or 10585276 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21001122112 its reverse (21122110012), we get a palindrome (42123232124).

The spelling of 21001122112 in words is "twenty-one billion, one million, one hundred twenty-two thousand, one hundred twelve".