211111213213 has 8 divisors (see below), whose sum is σ = 212528283128. Its totient is φ = 209695060224.

The previous prime is 211111213147. The next prime is 211111213217. The reversal of 211111213213 is 312312111112.

It can be written as a sum of positive squares in 4 ways, for example, as 14470405849 + 196640807364 = 120293^2 + 443442^2 .

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 211111213213 - 2⁹ = 211111212701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111213217) 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, 235945 + ... + 691297.

It is an arithmetic number, because the mean of its divisors is an integer number (26566035391).

Almost surely, 2^211111213213 is an apocalyptic number.

It is an amenable number.

211111213213 is a deficient number, since it is larger than the sum of its proper divisors (1417069915).

211111213213 is a wasteful number, since it uses less digits than its factorization.

211111213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458463.

The product of its digits is 72, while the sum is 19.

Adding to 211111213213 its reverse (312312111112), we get a palindrome (523423324325).

The spelling of 211111213213 in words is "two hundred eleven billion, one hundred eleven million, two hundred thirteen thousand, two hundred thirteen".