212122111110 has 128 divisors (see below), whose sum is σ = 643510877184. Its totient is φ = 43545807360.

The previous prime is 212122111081. The next prime is 212122111127. The reversal of 212122111110 is 11111221212.

It is a happy number.

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 212122111110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 948996 + ... + 1151015.

It is an arithmetic number, because the mean of its divisors is an integer number (5027428728).

Almost surely, 2^212122111110 is an apocalyptic number.

212122111110 is an abundant number, since it is smaller than the sum of its proper divisors (431388766074).

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

212122111110 is a wasteful number, since it uses less digits than its factorization.

212122111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100078.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212122111110 its reverse (11111221212), we get a palindrome (223233332322).

The spelling of 212122111110 in words is "two hundred twelve billion, one hundred twenty-two million, one hundred eleven thousand, one hundred ten".