21012210112 has 28 divisors (see below), whose sum is σ = 41722645536. Its totient is φ = 10499417600.

The previous prime is 21012210049. The next prime is 21012210113. The reversal of 21012210112 is 21101221012.

It is a junction number, because it is equal to n+sod(n) for n = 21012210092 and 21012210101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012210113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2389 + ... + 205012.

Almost surely, 2^21012210112 is an apocalyptic number.

It is an amenable number.

21012210112 is a deficient number, since it is larger than the sum of its proper divisors (20710435424).

21012210112 is a wasteful number, since it uses less digits than its factorization.

21012210112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208996 (or 208986 counting only the distinct ones).

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

Adding to 21012210112 its reverse (21101221012), we get a palindrome (42113431124).

The spelling of 21012210112 in words is "twenty-one billion, twelve million, two hundred ten thousand, one hundred twelve".