2011111121081 has 2 divisors, whose sum is σ = 2011111121082. Its totient is φ = 2011111121080.

The previous prime is 2011111121069. The next prime is 2011111121137. The reversal of 2011111121081 is 1801211111102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1561787581225 + 449323539856 = 1249715^2 + 670316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011111121081 is a prime.

It is a super-2 number, since 2×2011111121081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2011111121681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005555560540 + 1005555560541.

It is an arithmetic number, because the mean of its divisors is an integer number (1005555560541).

Almost surely, 2^{2011111121081} is an apocalyptic number.

It is an amenable number.

2011111121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011111121081 is an equidigital number, since it uses as much as digits as its factorization.

2011111121081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 20.

Adding to 2011111121081 its reverse (1801211111102), we get a palindrome (3812322232183).

The spelling of 2011111121081 in words is "two trillion, eleven billion, one hundred eleven million, one hundred twenty-one thousand, eighty-one".