1011111212111 has 32 divisors (see below), whose sum is σ = 1386460551168. Its totient is φ = 711798877440.

The previous prime is 1011111212053. The next prime is 1011111212117. The reversal of 1011111212111 is 1112121111101.

It is not a de Polignac number, because 1011111212111 - 2⁶ = 1011111212047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011111212117) 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, 10698710 + ... + 10792803.

It is an arithmetic number, because the mean of its divisors is an integer number (43326892224).

Almost surely, 2^{1011111212111} is an apocalyptic number.

1011111212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1011111212111 is a deficient number, since it is larger than the sum of its proper divisors (375349339057).

1011111212111 is a wasteful number, since it uses less digits than its factorization.

1011111212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21491591.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 1011111212111 its reverse (1112121111101), we get a palindrome (2123232323212).

The spelling of 1011111212111 in words is "one trillion, eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".