1021112011111 has 4 divisors (see below), whose sum is σ = 1021309638112. Its totient is φ = 1020914384112.

The previous prime is 1021112011109. The next prime is 1021112011121. The reversal of 1021112011111 is 1111102111201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021112011111 - 2¹ = 1021112011109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021112011091 and 1021112011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021112011121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98805750 + ... + 98816083.

It is an arithmetic number, because the mean of its divisors is an integer number (255327409528).

Almost surely, 2^{1021112011111} is an apocalyptic number.

1021112011111 is a deficient number, since it is larger than the sum of its proper divisors (197627001).

1021112011111 is an equidigital number, since it uses as much as digits as its factorization.

1021112011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197627000.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1021112011111 its reverse (1111102111201), we get a palindrome (2132214122312).

It can be divided in two parts, 102111201 and 1111, that multiplied together give a palindrome (113445544311).

The spelling of 1021112011111 in words is "one trillion, twenty-one billion, one hundred twelve million, eleven thousand, one hundred eleven".