21001122111112 has 32 divisors (see below), whose sum is σ = 46261213044480. Its totient is φ = 8811659626560.

The previous prime is 21001122111097. The next prime is 21001122111113. The reversal of 21001122111112 is 21111122110012.

It is not an unprimeable number, because it can be changed into a prime (21001122111113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9178810968 + ... + 9178813255.

It is an arithmetic number, because the mean of its divisors is an integer number (1445662907640).

Almost surely, 2^{21001122111112} is an apocalyptic number.

21001122111112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21001122111112 is an abundant number, since it is smaller than the sum of its proper divisors (25260090933368).

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

21001122111112 is a wasteful number, since it uses less digits than its factorization.

21001122111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18357624253 (or 18357624249 counting only the distinct ones).

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

Adding to 21001122111112 its reverse (21111122110012), we get a palindrome (42112244221124).

The spelling of 21001122111112 in words is "twenty-one trillion, one billion, one hundred twenty-two million, one hundred eleven thousand, one hundred twelve".