212120110111 has 16 divisors (see below), whose sum is σ = 266398888000. Its totient is φ = 167831292384.

The previous prime is 212120110087. The next prime is 212120110133. The reversal of 212120110111 is 111011021212.

It is a happy number.

It is not a de Polignac number, because 212120110111 - 2⁵ = 212120110079 is a prime.

It is a super-2 number, since 2×212120110111² (a number of 23 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 212120110091 and 212120110100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212120110171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23781156 + ... + 23790073.

It is an arithmetic number, because the mean of its divisors is an integer number (16649930500).

Almost surely, 2^212120110111 is an apocalyptic number.

212120110111 is a deficient number, since it is larger than the sum of its proper divisors (54278777889).

212120110111 is an equidigital number, since it uses as much as digits as its factorization.

212120110111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47571263 (or 47571249 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 212120110111 its reverse (111011021212), we get a palindrome (323131131323).

It can be divided in two parts, 2121201 and 10111, that added together give a palindrome (2131312).

The spelling of 212120110111 in words is "two hundred twelve billion, one hundred twenty million, one hundred ten thousand, one hundred eleven".