11001222211221 has 48 divisors (see below), whose sum is σ = 17805811103808. Its totient is φ = 6486467040000.

The previous prime is 11001222211207. The next prime is 11001222211241. The reversal of 11001222211221 is 12211222210011.

11001222211221 is a `hidden beast` number, since 1 + 10 + 0 + 1 + 222 + 211 + 221 = 666.

It is not a de Polignac number, because 11001222211221 - 2¹⁸ = 11001221949077 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11001222211194 and 11001222211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001222211241) 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, 32803830 + ... + 33137496.

It is an arithmetic number, because the mean of its divisors is an integer number (370954397996).

Almost surely, 2^{11001222211221} is an apocalyptic number.

11001222211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11001222211221 is a deficient number, since it is larger than the sum of its proper divisors (6804588892587).

11001222211221 is a wasteful number, since it uses less digits than its factorization.

11001222211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342722 (or 342719 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11001222211221 its reverse (12211222210011), we get a palindrome (23212444421232).

It can be divided in two parts, 11001 and 222211221, that added together give a palindrome (222222222).

The spelling of 11001222211221 in words is "eleven trillion, one billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-one".