1001221212011 has 2 divisors, whose sum is σ = 1001221212012. Its totient is φ = 1001221212010.

The previous prime is 1001221211957. The next prime is 1001221212029. The reversal of 1001221212011 is 1102121221001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1001221212011 - 2¹⁴ = 1001221195627 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001221212071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610606005 + 500610606006.

It is an arithmetic number, because the mean of its divisors is an integer number (500610606006).

Almost surely, 2^{1001221212011} is an apocalyptic number.

1001221212011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001221212011 is an equidigital number, since it uses as much as digits as its factorization.

1001221212011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001221212011 its reverse (1102121221001), we get a palindrome (2103342433012).

The spelling of 1001221212011 in words is "one trillion, one billion, two hundred twenty-one million, two hundred twelve thousand, eleven".