1021112211111 has 32 divisors (see below), whose sum is σ = 1466195385600. Its totient is φ = 629756167680.

The previous prime is 1021112211109. The next prime is 1021112211113. The reversal of 1021112211111 is 1111122111201.

It is an interprime number because it is at equal distance from previous prime (1021112211109) and next prime (1021112211113).

It is not a de Polignac number, because 1021112211111 - 2¹ = 1021112211109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021112211113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29504005 + ... + 29538593.

It is an arithmetic number, because the mean of its divisors is an integer number (45818605800).

Almost surely, 2^{1021112211111} is an apocalyptic number.

1021112211111 is a deficient number, since it is larger than the sum of its proper divisors (445083174489).

1021112211111 is a wasteful number, since it uses less digits than its factorization.

1021112211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44479.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1021112211111 its reverse (1111122111201), we get a palindrome (2132234322312).

The spelling of 1021112211111 in words is "one trillion, twenty-one billion, one hundred twelve million, two hundred eleven thousand, one hundred eleven".