21001200021112 has 32 divisors (see below), whose sum is σ = 39512544598800. Its totient is φ = 10464523098624.

The previous prime is 21001200021101. The next prime is 21001200021133. The reversal of 21001200021112 is 21112000210012.

It is a junction number, because it is equal to n+sod(n) for n = 21001200021092 and 21001200021101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149235439 + ... + 149376097.

Almost surely, 2^{21001200021112} is an apocalyptic number.

It is an amenable number.

21001200021112 is a deficient number, since it is larger than the sum of its proper divisors (18511344577688).

21001200021112 is a wasteful number, since it uses less digits than its factorization.

21001200021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204655 (or 204651 counting only the distinct ones).

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

Adding to 21001200021112 its reverse (21112000210012), we get a palindrome (42113200231124).

The spelling of 21001200021112 in words is "twenty-one trillion, one billion, two hundred million, twenty-one thousand, one hundred twelve".