21102110212 has 12 divisors (see below), whose sum is σ = 36970615836. Its totient is φ = 10539077120.

The previous prime is 21102110203. The next prime is 21102110257. The reversal of 21102110212 is 21201120112.

It can be written as a sum of positive squares in 2 ways, for example, as 9733006336 + 11369103876 = 98656^2 + 106626^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102110192 and 21102110201.

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, 2990533 + ... + 2997580.

It is an arithmetic number, because the mean of its divisors is an integer number (3080884653).

Almost surely, 2^21102110212 is an apocalyptic number.

It is an amenable number.

21102110212 is a deficient number, since it is larger than the sum of its proper divisors (15868505624).

21102110212 is a wasteful number, since it uses less digits than its factorization.

21102110212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5988998 (or 5988996 counting only the distinct ones).

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

Adding to 21102110212 its reverse (21201120112), we get a palindrome (42303230324).

The spelling of 21102110212 in words is "twenty-one billion, one hundred two million, one hundred ten thousand, two hundred twelve".