1221122222011 has 2 divisors, whose sum is σ = 1221122222012. Its totient is φ = 1221122222010.

The previous prime is 1221122222009. The next prime is 1221122222053. The reversal of 1221122222011 is 1102222211221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221122222011 - 2¹ = 1221122222009 is a prime.

It is a super-2 number, since 2×1221122222011² (a number of 25 digits) contains 22 as substring.

Together with 1221122222009, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221122222011.

It is not a weakly prime, because it can be changed into another prime (1221122222081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610561111005 + 610561111006.

It is an arithmetic number, because the mean of its divisors is an integer number (610561111006).

Almost surely, 2^{1221122222011} is an apocalyptic number.

1221122222011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221122222011 is an equidigital number, since it uses as much as digits as its factorization.

1221122222011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221122222011 its reverse (1102222211221), we get a palindrome (2323344433232).

The spelling of 1221122222011 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, eleven".