212121101111 has 8 divisors (see below), whose sum is σ = 214686385200. Its totient is φ = 209556045952.

The previous prime is 212121101107. The next prime is 212121101123. The reversal of 212121101111 is 111101121212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212121101111 - 2² = 212121101107 is a prime.

It is a super-3 number, since 3×212121101111³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121101191) 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, 2485301 + ... + 2569233.

It is an arithmetic number, because the mean of its divisors is an integer number (26835798150).

Almost surely, 2^212121101111 is an apocalyptic number.

212121101111 is a deficient number, since it is larger than the sum of its proper divisors (2565284089).

212121101111 is an equidigital number, since it uses as much as digits as its factorization.

212121101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114465.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 212121101111 its reverse (111101121212), we get a palindrome (323222222323).

It can be divided in two parts, 212121101 and 111, that added together give a palindrome (212121212).

The spelling of 212121101111 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred one thousand, one hundred eleven".