21020011112 has 16 divisors (see below), whose sum is σ = 39414062400. Its totient is φ = 10509594480.

The previous prime is 21020011109. The next prime is 21020011139. The reversal of 21020011112 is 21111002012.

It is a junction number, because it is equal to n+sod(n) for n = 21020011093 and 21020011102.

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, 354839 + ... + 409817.

It is an arithmetic number, because the mean of its divisors is an integer number (2463378900).

Almost surely, 2^21020011112 is an apocalyptic number.

It is an amenable number.

21020011112 is a deficient number, since it is larger than the sum of its proper divisors (18394051288).

21020011112 is a wasteful number, since it uses less digits than its factorization.

21020011112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102776 (or 102772 counting only the distinct ones).

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

Adding to 21020011112 its reverse (21111002012), we get a palindrome (42131013124).

The spelling of 21020011112 in words is "twenty-one billion, twenty million, eleven thousand, one hundred twelve".