21110111210110 has 16 divisors (see below), whose sum is σ = 40921138653696. Its totient is φ = 7794502600608.

The previous prime is 21110111210059. The next prime is 21110111210119. The reversal of 21110111210110 is 1101211101112.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110111210119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81192735294 + ... + 81192735553.

It is an arithmetic number, because the mean of its divisors is an integer number (2557571165856).

Almost surely, 2^{21110111210110} is an apocalyptic number.

21110111210110 is a deficient number, since it is larger than the sum of its proper divisors (19811027443586).

21110111210110 is a wasteful number, since it uses less digits than its factorization.

21110111210110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162385470867.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21110111210110 its reverse (1101211101112), we get a palindrome (22211322311222).

The spelling of 21110111210110 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, two hundred ten thousand, one hundred ten".