211213211111 has 4 divisors (see below), whose sum is σ = 241386526992. Its totient is φ = 181039895232.

The previous prime is 211213211101. The next prime is 211213211137. The reversal of 211213211111 is 111112312112.

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

It is not a de Polignac number, because 211213211111 - 2²² = 211209016807 is a prime.

It is a super-2 number, since 2×211213211111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211213211111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211213211101) 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, 15086657930 + ... + 15086657943.

It is an arithmetic number, because the mean of its divisors is an integer number (60346631748).

Almost surely, 2^211213211111 is an apocalyptic number.

211213211111 is a deficient number, since it is larger than the sum of its proper divisors (30173315881).

211213211111 is an equidigital number, since it uses as much as digits as its factorization.

211213211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30173315880.

The product of its digits is 24, while the sum is 17.

Adding to 211213211111 its reverse (111112312112), we get a palindrome (322325523223).

The spelling of 211213211111 in words is "two hundred eleven billion, two hundred thirteen million, two hundred eleven thousand, one hundred eleven".