321111211111 has 2 divisors, whose sum is σ = 321111211112. Its totient is φ = 321111211110.

The previous prime is 321111211093. The next prime is 321111211123. The reversal of 321111211111 is 111112111123.

It is a m-pointer prime, because the next prime (321111211123) can be obtained adding 321111211111 to its product of digits (12).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 321111211111 - 2²⁷ = 320976993383 is a prime.

It is a super-2 number, since 2×321111211111² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321111211151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160555605555 + 160555605556.

It is an arithmetic number, because the mean of its divisors is an integer number (160555605556).

Almost surely, 2^321111211111 is an apocalyptic number.

321111211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

321111211111 is an equidigital number, since it uses as much as digits as its factorization.

321111211111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12, while the sum is 16.

Adding to 321111211111 its reverse (111112111123), we get a palindrome (432223322234).

It can be divided in two parts, 3211112 and 11111, that added together give a palindrome (3222223).

The spelling of 321111211111 in words is "three hundred twenty-one billion, one hundred eleven million, two hundred eleven thousand, one hundred eleven".