11111221222101 has 192 divisors, whose sum is σ = 22671260591616. Its totient is φ = 5057609932800.

The previous prime is 11111221222081. The next prime is 11111221222151. The reversal of 11111221222101 is 10122212211111.

It is a happy number.

11111221222101 is a `hidden beast` number, since 11 + 111 + 221 + 222 + 101 = 666.

It is not a de Polignac number, because 11111221222101 - 2¹⁵ = 11111221189333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111221222151) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 13260145 + ... + 14073161.

It is an arithmetic number, because the mean of its divisors is an integer number (118079482248).

Almost surely, 2^{11111221222101} is an apocalyptic number.

11111221222101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111221222101 is an abundant number, since it is smaller than the sum of its proper divisors (11560039369515).

11111221222101 is a wasteful number, since it uses less digits than its factorization.

11111221222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813132 (or 813129 counting only the distinct ones).

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

Adding to 11111221222101 its reverse (10122212211111), we get a palindrome (21233433433212).

The spelling of 11111221222101 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred one".