1011111021187 has 2 divisors, whose sum is σ = 1011111021188. Its totient is φ = 1011111021186.

The previous prime is 1011111021163. The next prime is 1011111021257. The reversal of 1011111021187 is 7811201111101.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011111021187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011111121187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505555510593 + 505555510594.

It is an arithmetic number, because the mean of its divisors is an integer number (505555510594).

Almost surely, 2^{1011111021187} is an apocalyptic number.

1011111021187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011111021187 is an equidigital number, since it uses as much as digits as its factorization.

1011111021187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 25.

Adding to 1011111021187 its reverse (7811201111101), we get a palindrome (8822312132288).

The spelling of 1011111021187 in words is "one trillion, eleven billion, one hundred eleven million, twenty-one thousand, one hundred eighty-seven".