21000233112 has 32 divisors (see below), whose sum is σ = 52550694000. Its totient is φ = 6993396224.

The previous prime is 21000233069. The next prime is 21000233117. The reversal of 21000233112 is 21133200012.

It is a junction number, because it is equal to n+sod(n) for n = 21000233091 and 21000233100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000233117) 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, 391893 + ... + 442244.

Almost surely, 2^21000233112 is an apocalyptic number.

It is an amenable number.

21000233112 is an abundant number, since it is smaller than the sum of its proper divisors (31550460888).

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

21000233112 is a wasteful number, since it uses less digits than its factorization.

21000233112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835195 (or 835191 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21000233112 its reverse (21133200012), we get a palindrome (42133433124).

The spelling of 21000233112 in words is "twenty-one billion, two hundred thirty-three thousand, one hundred twelve".