212210121111 has 4 divisors (see below), whose sum is σ = 282946828152. Its totient is φ = 141473414072.

The previous prime is 212210121089. The next prime is 212210121119. The reversal of 212210121111 is 111121012212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212210121111 - 2⁶ = 212210121047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210121119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35368353516 + ... + 35368353521.

It is an arithmetic number, because the mean of its divisors is an integer number (70736707038).

Almost surely, 2^212210121111 is an apocalyptic number.

212210121111 is a deficient number, since it is larger than the sum of its proper divisors (70736707041).

212210121111 is an equidigital number, since it uses as much as digits as its factorization.

212210121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70736707040.

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

Adding to 212210121111 its reverse (111121012212), we get a palindrome (323331133323).

The spelling of 212210121111 in words is "two hundred twelve billion, two hundred ten million, one hundred twenty-one thousand, one hundred eleven".