21110111112102 has 16 divisors (see below), whose sum is σ = 42220299833712. Its totient is φ = 7036690769120.

The previous prime is 21110111112059. The next prime is 21110111112121. The reversal of 21110111112102 is 20121111101112.

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, 663652 + ... + 6531512.

It is an arithmetic number, because the mean of its divisors is an integer number (2638768739607).

Almost surely, 2^{21110111112102} is an apocalyptic number.

21110111112102 is an abundant number, since it is smaller than the sum of its proper divisors (21110188721610).

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

21110111112102 is a wasteful number, since it uses less digits than its factorization.

21110111112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6467463.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21110111112102 its reverse (20121111101112), we get a palindrome (41231222213214).

The spelling of 21110111112102 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, one hundred twelve thousand, one hundred two".