1111212212211 has 12 divisors (see below), whose sum is σ = 1620976231680. Its totient is φ = 733473406800.

The previous prime is 1111212212191. The next prime is 1111212212221. The reversal of 1111212212211 is 1122122121111.

It is a happy number.

1111212212211 is a `hidden beast` number, since 111 + 121 + 221 + 2 + 211 = 666.

It is not a de Polignac number, because 1111212212211 - 2¹⁵ = 1111212179443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1111212212221) 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 11 ways as a sum of consecutive naturals, for example, 611226931 + ... + 611228748.

It is an arithmetic number, because the mean of its divisors is an integer number (135081352640).

Almost surely, 2^{1111212212211} is an apocalyptic number.

1111212212211 is a deficient number, since it is larger than the sum of its proper divisors (509764019469).

1111212212211 is a wasteful number, since it uses less digits than its factorization.

1111212212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222455786 (or 1222455783 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 1111212212211 its reverse (1122122121111), we get a palindrome (2233334333322).

The spelling of 1111212212211 in words is "one trillion, one hundred eleven billion, two hundred twelve million, two hundred twelve thousand, two hundred eleven".