21111221102110 has 16 divisors (see below), whose sum is σ = 38376437569632. Its totient is φ = 8360879644000.

The previous prime is 21111221102099. The next prime is 21111221102131. The reversal of 21111221102110 is 1120112211112.

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, 10451098546 + ... + 10451100565.

It is an arithmetic number, because the mean of its divisors is an integer number (2398527348102).

Almost surely, 2^{21111221102110} is an apocalyptic number.

21111221102110 is a deficient number, since it is larger than the sum of its proper divisors (17265216467522).

21111221102110 is a wasteful number, since it uses less digits than its factorization.

21111221102110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20902199219.

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

Adding to 21111221102110 its reverse (1120112211112), we get a palindrome (22231333313222).

The spelling of 21111221102110 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred two thousand, one hundred ten".