11021111201221 has 16 divisors (see below), whose sum is σ = 12048296025600. Its totient is φ = 9998139296880.

The previous prime is 11021111201209. The next prime is 11021111201281. The reversal of 11021111201221 is 12210211112011.

It is a cyclic number.

It is not a de Polignac number, because 11021111201221 - 2³⁹ = 10471355387333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11021111201195 and 11021111201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021111201281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160391730 + ... + 160460428.

It is an arithmetic number, because the mean of its divisors is an integer number (753018501600).

Almost surely, 2^{11021111201221} is an apocalyptic number.

11021111201221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11021111201221 is a deficient number, since it is larger than the sum of its proper divisors (1027184824379).

11021111201221 is a wasteful number, since it uses less digits than its factorization.

11021111201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99144.

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

Adding to 11021111201221 its reverse (12210211112011), we get a palindrome (23231322313232).

The spelling of 11021111201221 in words is "eleven trillion, twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".