1011001021109 has 2 divisors, whose sum is σ = 1011001021110. Its totient is φ = 1011001021108.

The previous prime is 1011001021097. The next prime is 1011001021111. The reversal of 1011001021109 is 9011201001101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 993819579025 + 17181442084 = 996905^2 + 131078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011001021109 is a prime.

It is a Sophie Germain prime.

Together with 1011001021111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011001021139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505500510554 + 505500510555.

It is an arithmetic number, because the mean of its divisors is an integer number (505500510555).

Almost surely, 2^{1011001021109} is an apocalyptic number.

It is an amenable number.

1011001021109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011001021109 is an equidigital number, since it uses as much as digits as its factorization.

1011001021109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 17.

The spelling of 1011001021109 in words is "one trillion, eleven billion, one million, twenty-one thousand, one hundred nine".