1021111101111 has 16 divisors (see below), whose sum is σ = 1369494002016. Its totient is φ = 676735287936.

The previous prime is 1021111101107. The next prime is 1021111101137. The reversal of 1021111101111 is 1111011111201.

It is not a de Polignac number, because 1021111101111 - 2² = 1021111101107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021111101151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5140801 + ... + 5335733.

It is an arithmetic number, because the mean of its divisors is an integer number (85593375126).

Almost surely, 2^{1021111101111} is an apocalyptic number.

1021111101111 is a deficient number, since it is larger than the sum of its proper divisors (348382900905).

1021111101111 is a wasteful number, since it uses less digits than its factorization.

1021111101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205202.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 1021111101111 its reverse (1111011111201), we get a palindrome (2132122212312).

The spelling of 1021111101111 in words is "one trillion, twenty-one billion, one hundred eleven million, one hundred one thousand, one hundred eleven".