21000112112 has 40 divisors (see below), whose sum is σ = 47489627136. Its totient is φ = 8808555456.

The previous prime is 21000112061. The next prime is 21000112127. The reversal of 21000112112 is 21121100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000112093 and 21000112102.

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, 1989428 + ... + 1999955.

Almost surely, 2^21000112112 is an apocalyptic number.

It is an amenable number.

21000112112 is an abundant number, since it is smaller than the sum of its proper divisors (26489515024).

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

21000112112 is a wasteful number, since it uses less digits than its factorization.

21000112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989445 (or 3989439 counting only the distinct ones).

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

Adding to 21000112112 its reverse (21121100012), we get a palindrome (42121212124).

The spelling of 21000112112 in words is "twenty-one billion, one hundred twelve thousand, one hundred twelve".