21102110012 has 24 divisors (see below), whose sum is σ = 38545253376. Its totient is φ = 10089441648.

The previous prime is 21102109991. The next prime is 21102110021. The reversal of 21102110012 is 21001120112.

It is a junction number, because it is equal to n+sod(n) for n = 21102109975 and 21102110002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312113 + ... + 373655.

It is an arithmetic number, because the mean of its divisors is an integer number (1606052224).

Almost surely, 2^21102110012 is an apocalyptic number.

It is an amenable number.

21102110012 is a deficient number, since it is larger than the sum of its proper divisors (17443143364).

21102110012 is a wasteful number, since it uses less digits than its factorization.

21102110012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65297 (or 65295 counting only the distinct ones).

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

Adding to 21102110012 its reverse (21001120112), we get a palindrome (42103230124).

The spelling of 21102110012 in words is "twenty-one billion, one hundred two million, one hundred ten thousand, twelve".