11011220001221 has 16 divisors (see below), whose sum is σ = 12181698418176. Its totient is φ = 9868990950000.

The previous prime is 11011220001193. The next prime is 11011220001277. The reversal of 11011220001221 is 12210002211011.

It is a cyclic number.

It is not a de Polignac number, because 11011220001221 - 2²² = 11011215806917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11011220001196 and 11011220001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011220009221) 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, 42114746 + ... + 42375396.

It is an arithmetic number, because the mean of its divisors is an integer number (761356151136).

Almost surely, 2^{11011220001221} is an apocalyptic number.

11011220001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11011220001221 is a deficient number, since it is larger than the sum of its proper divisors (1170478416955).

11011220001221 is a wasteful number, since it uses less digits than its factorization.

11011220001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314824.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11011220001221 its reverse (12210002211011), we get a palindrome (23221222212232).

The spelling of 11011220001221 in words is "eleven trillion, eleven billion, two hundred twenty million, one thousand, two hundred twenty-one".