1001001201111 has 6 divisors (see below), whose sum is σ = 1445890623840. Its totient is φ = 667334134068.

The previous prime is 1001001201043. The next prime is 1001001201121. The reversal of 1001001201111 is 1111021001001.

It is not a de Polignac number, because 1001001201111 - 2¹¹ = 1001001199063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 111222355679 = 1001001201111 / (1 + 0 + 0 + 1 + 0 + 0 + 1 + 2 + 0 + 1 + 1 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 1001001201093 and 1001001201102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001001201121) 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 5 ways as a sum of consecutive naturals, for example, 55611177831 + ... + 55611177848.

It is an arithmetic number, because the mean of its divisors is an integer number (240981770640).

Almost surely, 2^{1001001201111} is an apocalyptic number.

1001001201111 is a deficient number, since it is larger than the sum of its proper divisors (444889422729).

1001001201111 is a wasteful number, since it uses less digits than its factorization.

1001001201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111222355685 (or 111222355682 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 1001001201111 its reverse (1111021001001), we get a palindrome (2112022202112).

The spelling of 1001001201111 in words is "one trillion, one billion, one million, two hundred one thousand, one hundred eleven".