21121120111110 has 64 divisors (see below), whose sum is σ = 52439392051200. Its totient is φ = 5438003824512.

The previous prime is 21121120111109. The next prime is 21121120111159. The reversal of 21121120111110 is 1111102112112.

It is a super-2 number, since 2×21121120111110² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21121120111110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84549771 + ... + 84799209.

It is an arithmetic number, because the mean of its divisors is an integer number (819365500800).

Almost surely, 2^{21121120111110} is an apocalyptic number.

21121120111110 is an abundant number, since it is smaller than the sum of its proper divisors (31318271940090).

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

21121120111110 is a wasteful number, since it uses less digits than its factorization.

21121120111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346805.

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

Adding to 21121120111110 its reverse (1111102112112), we get a palindrome (22232222223222).

The spelling of 21121120111110 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, one hundred eleven thousand, one hundred ten".