1021011111011 has 4 divisors (see below), whose sum is σ = 1022506003512. Its totient is φ = 1019516218512.

The previous prime is 1021011111007. The next prime is 1021011111031. The reversal of 1021011111011 is 1101111101201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021011111011 - 2² = 1021011111007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021011110983 and 1021011111001.

It is not an unprimeable number, because it can be changed into a prime (1021011111031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747445226 + ... + 747446591.

It is an arithmetic number, because the mean of its divisors is an integer number (255626500878).

Almost surely, 2^{1021011111011} is an apocalyptic number.

1021011111011 is a deficient number, since it is larger than the sum of its proper divisors (1494892501).

1021011111011 is an equidigital number, since it uses as much as digits as its factorization.

1021011111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494892500.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 1021011111011 its reverse (1101111101201), we get a palindrome (2122122212212).

The spelling of 1021011111011 in words is "one trillion, twenty-one billion, eleven million, one hundred eleven thousand, eleven".