312222221111 has 2 divisors, whose sum is σ = 312222221112. Its totient is φ = 312222221110.

The previous prime is 312222221099. The next prime is 312222221131. The reversal of 312222221111 is 111122222213.

It is an a-pointer prime, because the next prime (312222221131) can be obtained adding 312222221111 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312222221111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312222221131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156111110555 + 156111110556.

It is an arithmetic number, because the mean of its divisors is an integer number (156111110556).

Almost surely, 2^312222221111 is an apocalyptic number.

312222221111 is a deficient number, since it is larger than the sum of its proper divisors (1).

312222221111 is an equidigital number, since it uses as much as digits as its factorization.

312222221111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

Adding to 312222221111 its reverse (111122222213), we get a palindrome (423344443324).

The spelling of 312222221111 in words is "three hundred twelve billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".