211321201111 has 4 divisors (see below), whose sum is σ = 211467243472. Its totient is φ = 211175158752.

The previous prime is 211321201073. The next prime is 211321201121. The reversal of 211321201111 is 111102123112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 211321201111 - 2⁷ = 211321200983 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 (211321201121) 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, 73019010 + ... + 73021903.

It is an arithmetic number, because the mean of its divisors is an integer number (52866810868).

Almost surely, 2^211321201111 is an apocalyptic number.

211321201111 is a deficient number, since it is larger than the sum of its proper divisors (146042361).

211321201111 is a wasteful number, since it uses less digits than its factorization.

211321201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146042360.

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

Adding to 211321201111 its reverse (111102123112), we get a palindrome (322423324223).

The spelling of 211321201111 in words is "two hundred eleven billion, three hundred twenty-one million, two hundred one thousand, one hundred eleven".