21111211121110 has 16 divisors (see below), whose sum is σ = 41454741838032. Its totient is φ = 7676804044000.

The previous prime is 21111211121093. The next prime is 21111211121141. The reversal of 21111211121110 is 1112111211112.

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, 95960050441 + ... + 95960050660.

It is an arithmetic number, because the mean of its divisors is an integer number (2590921364877).

Almost surely, 2^{21111211121110} is an apocalyptic number.

21111211121110 is a deficient number, since it is larger than the sum of its proper divisors (20343530716922).

21111211121110 is a wasteful number, since it uses less digits than its factorization.

21111211121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191920101119.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 21111211121110 its reverse (1112111211112), we get a palindrome (22223322332222).

The spelling of 21111211121110 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-one thousand, one hundred ten".