212101001111 has 4 divisors (see below), whose sum is σ = 221322783792. Its totient is φ = 202879218432.

The previous prime is 212101001107. The next prime is 212101001117. The reversal of 212101001111 is 111100101212.

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

It is not a de Polignac number, because 212101001111 - 2² = 212101001107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212101001092 and 212101001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101001117) 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, 4610891306 + ... + 4610891351.

It is an arithmetic number, because the mean of its divisors is an integer number (55330695948).

Almost surely, 2^212101001111 is an apocalyptic number.

212101001111 is a deficient number, since it is larger than the sum of its proper divisors (9221782681).

212101001111 is an equidigital number, since it uses as much as digits as its factorization.

212101001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9221782680.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 212101001111 its reverse (111100101212), we get a palindrome (323201102323).

The spelling of 212101001111 in words is "two hundred twelve billion, one hundred one million, one thousand, one hundred eleven".