11001021122221 has 16 divisors (see below), whose sum is σ = 12041729280000. Its totient is φ = 9988102365120.

The previous prime is 11001021122207. The next prime is 11001021122249. The reversal of 11001021122221 is 12222112010011.

It is a cyclic number.

It is not a de Polignac number, because 11001021122221 - 2¹⁹ = 11001020597933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001021122195 and 11001021122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001021122251) 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 15 ways as a sum of consecutive naturals, for example, 45717780 + ... + 45957778.

It is an arithmetic number, because the mean of its divisors is an integer number (752608080000).

Almost surely, 2^{11001021122221} is an apocalyptic number.

It is an amenable number.

11001021122221 is a deficient number, since it is larger than the sum of its proper divisors (1040708157779).

11001021122221 is a wasteful number, since it uses less digits than its factorization.

11001021122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297876.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11001021122221 its reverse (12222112010011), we get a palindrome (23223133132232).

The spelling of 11001021122221 in words is "eleven trillion, one billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".