21102111012102 has 16 divisors (see below), whose sum is σ = 42536538734592. Its totient is φ = 6978650885640.

The previous prime is 21102111012011. The next prime is 21102111012127. The reversal of 21102111012102 is 20121011120112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13846528774 + ... + 13846530297.

It is an arithmetic number, because the mean of its divisors is an integer number (2658533670912).

Almost surely, 2^{21102111012102} is an apocalyptic number.

21102111012102 is an abundant number, since it is smaller than the sum of its proper divisors (21434427722490).

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

21102111012102 is a wasteful number, since it uses less digits than its factorization.

21102111012102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27693059203.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21102111012102 its reverse (20121011120112), we get a palindrome (41223122132214).

The spelling of 21102111012102 in words is "twenty-one trillion, one hundred two billion, one hundred eleven million, twelve thousand, one hundred two".