213212101111 has 4 divisors (see below), whose sum is σ = 213657220800. Its totient is φ = 212766981424.

The previous prime is 213212101061. The next prime is 213212101139. The reversal of 213212101111 is 111101212312.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213212101111 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 (213212101181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222559126 + ... + 222560083.

It is an arithmetic number, because the mean of its divisors is an integer number (53414305200).

Almost surely, 2^213212101111 is an apocalyptic number.

213212101111 is a deficient number, since it is larger than the sum of its proper divisors (445119689).

213212101111 is an equidigital number, since it uses as much as digits as its factorization.

213212101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445119688.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 213212101111 its reverse (111101212312), we get a palindrome (324313313423).

The spelling of 213212101111 in words is "two hundred thirteen billion, two hundred twelve million, one hundred one thousand, one hundred eleven".