1111111212211 has 48 divisors (see below), whose sum is σ = 1518027585984. Its totient is φ = 791287200000.

The previous prime is 1111111212187. The next prime is 1111111212251. The reversal of 1111111212211 is 1122121111111.

It is not a de Polignac number, because 1111111212211 - 2¹⁵ = 1111111179443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1111111212251) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 612561 + ... + 1611661.

It is an arithmetic number, because the mean of its divisors is an integer number (31625574708).

Almost surely, 2^{1111111212211} is an apocalyptic number.

1111111212211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1111111212211 is a deficient number, since it is larger than the sum of its proper divisors (406916373773).

1111111212211 is a wasteful number, since it uses less digits than its factorization.

1111111212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999244 (or 999233 counting only the distinct ones).

The product of its digits is 8, while the sum is 16.

Adding to 1111111212211 its reverse (1122121111111), we get a palindrome (2233232323322).

The spelling of 1111111212211 in words is "one trillion, one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, two hundred eleven".