21211112110110 has 64 divisors (see below), whose sum is σ = 54823121559360. Its totient is φ = 5221143982080.

The previous prime is 21211112110063. The next prime is 21211112110171. The reversal of 21211112110110 is 1101121111212.

It is a super-2 number, since 2×21211112110110² (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 21211112110110.

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, 50123086 + ... + 50544494.

It is an arithmetic number, because the mean of its divisors is an integer number (856611274365).

Almost surely, 2^{21211112110110} is an apocalyptic number.

21211112110110 is an abundant number, since it is smaller than the sum of its proper divisors (33612009449250).

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

21211112110110 is a wasteful number, since it uses less digits than its factorization.

21211112110110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550493.

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

Adding to 21211112110110 its reverse (1101121111212), we get a palindrome (22312233221322).

The spelling of 21211112110110 in words is "twenty-one trillion, two hundred eleven billion, one hundred twelve million, one hundred ten thousand, one hundred ten".