11111012022221 has 16 divisors (see below), whose sum is σ = 11721280867968. Its totient is φ = 10511484825600.

The previous prime is 11111012022193. The next prime is 11111012022239. The reversal of 11111012022221 is 12222021011111.

It is a cyclic number.

It is not a de Polignac number, because 11111012022221 - 2⁶ = 11111012022157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11111012022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111012022281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1789181 + ... + 5042141.

It is an arithmetic number, because the mean of its divisors is an integer number (732580054248).

Almost surely, 2^{11111012022221} is an apocalyptic number.

It is an amenable number.

11111012022221 is a deficient number, since it is larger than the sum of its proper divisors (610268845747).

11111012022221 is a wasteful number, since it uses less digits than its factorization.

11111012022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254612.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11111012022221 its reverse (12222021011111), we get a palindrome (23333033033332).

The spelling of 11111012022221 in words is "eleven trillion, one hundred eleven billion, twelve million, twenty-two thousand, two hundred twenty-one".