1211001020011 has 2 divisors, whose sum is σ = 1211001020012. Its totient is φ = 1211001020010.

The previous prime is 1211001019951. The next prime is 1211001020039. The reversal of 1211001020011 is 1100201001121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211001020011 - 2⁷ = 1211001019883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211001020011.

It is not a weakly prime, because it can be changed into another prime (1211001020041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605500510005 + 605500510006.

It is an arithmetic number, because the mean of its divisors is an integer number (605500510006).

Almost surely, 2^{1211001020011} is an apocalyptic number.

1211001020011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211001020011 is an equidigital number, since it uses as much as digits as its factorization.

1211001020011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1211001020011 its reverse (1100201001121), we get a palindrome (2311202021132).

The spelling of 1211001020011 in words is "one trillion, two hundred eleven billion, one million, twenty thousand, eleven".