212111110 has 16 divisors (see below), whose sum is σ = 385582032. Its totient is φ = 84004000.

The previous prime is 212111101. The next prime is 212111111. The reversal of 212111110 is 11111212.

It is a super-2 number, since 2×212111110² = 89982245970864200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111111) 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, 103996 + ... + 106015.

It is an arithmetic number, because the mean of its divisors is an integer number (24098877).

Almost surely, 2^212111110 is an apocalyptic number.

212111110 is a deficient number, since it is larger than the sum of its proper divisors (173470922).

212111110 is a wasteful number, since it uses less digits than its factorization.

212111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210119.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 212111110 is about 14564.0348118233. The cubic root of 212111110 is about 596.3773472584.

Adding to 212111110 its reverse (11111212), we get a palindrome (223222322).

It can be divided in two parts, 2121 and 11110, that added together give a palindrome (13231).

The spelling of 212111110 in words is "two hundred twelve million, one hundred eleven thousand, one hundred ten".