21111102020102 has 16 divisors (see below), whose sum is σ = 33043764741120. Its totient is φ = 10096522126152.

The previous prime is 21111102020059. The next prime is 21111102020111. The reversal of 21111102020102 is 20102020111112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3163403 + ... + 7226985.

It is an arithmetic number, because the mean of its divisors is an integer number (2065235296320).

Almost surely, 2^{21111102020102} is an apocalyptic number.

21111102020102 is a deficient number, since it is larger than the sum of its proper divisors (11932662721018).

21111102020102 is a wasteful number, since it uses less digits than its factorization.

21111102020102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176547.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111102020102 its reverse (20102020111112), we get a palindrome (41213122131214).

The spelling of 21111102020102 in words is "twenty-one trillion, one hundred eleven billion, one hundred two million, twenty thousand, one hundred two".