11011212222221 has 16 divisors (see below), whose sum is σ = 11696884422768. Its totient is φ = 10329781862400.

The previous prime is 11011212222211. The next prime is 11011212222271. The reversal of 11011212222221 is 12222221211011.

It can be written as a sum of positive squares in 8 ways, for example, as 2913374473321 + 8097837748900 = 1706861^2 + 2845670^2 .

It is not a de Polignac number, because 11011212222221 - 2¹⁰ = 11011212221197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011212222193 and 11011212222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011212222211) 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, 13903061 + ... + 14673701.

It is an arithmetic number, because the mean of its divisors is an integer number (731055276423).

Almost surely, 2^{11011212222221} is an apocalyptic number.

It is an amenable number.

11011212222221 is a deficient number, since it is larger than the sum of its proper divisors (685672200547).

11011212222221 is a wasteful number, since it uses less digits than its factorization.

11011212222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773392.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11011212222221 its reverse (12222221211011), we get a palindrome (23233433433232).

The spelling of 11011212222221 in words is "eleven trillion, eleven billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-one".