21102111112102 has 4 divisors (see below), whose sum is σ = 31653166668156. Its totient is φ = 10551055556050.

The previous prime is 21102111112037. The next prime is 21102111112133. The reversal of 21102111112102 is 20121111120112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275527778024 + ... + 5275527778027.

It is an arithmetic number, because the mean of its divisors is an integer number (7913291667039).

Almost surely, 2^{21102111112102} is an apocalyptic number.

21102111112102 is a deficient number, since it is larger than the sum of its proper divisors (10551055556054).

21102111112102 is a wasteful number, since it uses less digits than its factorization.

21102111112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10551055556053.

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

Adding to 21102111112102 its reverse (20121111120112), we get a palindrome (41223222232214).

The spelling of 21102111112102 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, one hundred twelve thousand, one hundred two".