1111221203211 has 36 divisors (see below), whose sum is σ = 1948334620752. Its totient is φ = 607375558944.

The previous prime is 1111221203207. The next prime is 1111221203293. The reversal of 1111221203211 is 1123021221111.

It is a happy number.

It is not a de Polignac number, because 1111221203211 - 2² = 1111221203207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1111221203311) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 54767596 + ... + 54787881.

It is an arithmetic number, because the mean of its divisors is an integer number (54120406132).

Almost surely, 2^{1111221203211} is an apocalyptic number.

1111221203211 is a deficient number, since it is larger than the sum of its proper divisors (837113417541).

1111221203211 is a wasteful number, since it uses less digits than its factorization.

1111221203211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109555520 (or 109555510 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1111221203211 its reverse (1123021221111), we get a palindrome (2234242424322).

The spelling of 1111221203211 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred three thousand, two hundred eleven".