11021112121221 has 16 divisors (see below), whose sum is σ = 17288019014400. Its totient is φ = 6915207605184.

The previous prime is 11021112121199. The next prime is 11021112121223. The reversal of 11021112121221 is 12212121112011.

It is a happy number.

11021112121221 is a `hidden beast` number, since 110 + 211 + 1 + 2 + 121 + 221 = 666.

It is not a de Polignac number, because 11021112121221 - 2¹⁰ = 11021112120197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11021112121194 and 11021112121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021112121223) 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, 12005568301 + ... + 12005569218.

It is an arithmetic number, because the mean of its divisors is an integer number (1080501188400).

Almost surely, 2^{11021112121221} is an apocalyptic number.

It is an amenable number.

11021112121221 is a deficient number, since it is larger than the sum of its proper divisors (6266906893179).

11021112121221 is a wasteful number, since it uses less digits than its factorization.

11021112121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24011137545 (or 24011137539 counting only the distinct ones).

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

Adding to 11021112121221 its reverse (12212121112011), we get a palindrome (23233233233232).

The spelling of 11021112121221 in words is "eleven trillion, twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".