123311222011 has 2 divisors, whose sum is σ = 123311222012. Its totient is φ = 123311222010.

The previous prime is 123311221997. The next prime is 123311222039. The reversal of 123311222011 is 110222113321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123311222011 - 2⁹ = 123311221499 is a prime.

It is a super-2 number, since 2×123311222011² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123311222011.

It is not a weakly prime, because it can be changed into another prime (123311222611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61655611005 + 61655611006.

It is an arithmetic number, because the mean of its divisors is an integer number (61655611006).

Almost surely, 2^123311222011 is an apocalyptic number.

123311222011 is a deficient number, since it is larger than the sum of its proper divisors (1).

123311222011 is an equidigital number, since it uses as much as digits as its factorization.

123311222011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 123311222011 its reverse (110222113321), we get a palindrome (233533335332).

The spelling of 123311222011 in words is "one hundred twenty-three billion, three hundred eleven million, two hundred twenty-two thousand, eleven".