1021011111611 has 2 divisors, whose sum is σ = 1021011111612. Its totient is φ = 1021011111610.

The previous prime is 1021011111583. The next prime is 1021011111683. The reversal of 1021011111611 is 1161111101201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021011111611 - 2²⁶ = 1020944002747 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021011111611.

It is not a weakly prime, because it can be changed into another prime (1021011111811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510505555805 + 510505555806.

It is an arithmetic number, because the mean of its divisors is an integer number (510505555806).

Almost surely, 2^{1021011111611} is an apocalyptic number.

1021011111611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021011111611 is an equidigital number, since it uses as much as digits as its factorization.

1021011111611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 1021011111611 its reverse (1161111101201), we get a palindrome (2182122212812).

The spelling of 1021011111611 in words is "one trillion, twenty-one billion, eleven million, one hundred eleven thousand, six hundred eleven".