11011221222221 has 16 divisors (see below), whose sum is σ = 12047428831680. Its totient is φ = 9980908504320.

The previous prime is 11011221222143. The next prime is 11011221222277. The reversal of 11011221222221 is 12222212211011.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011221222221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11011221222193 and 11011221222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011221252221) 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, 6518645 + ... + 8032133.

It is an arithmetic number, because the mean of its divisors is an integer number (752964301980).

Almost surely, 2^{11011221222221} is an apocalyptic number.

11011221222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11011221222221 is a deficient number, since it is larger than the sum of its proper divisors (1036207609459).

11011221222221 is a wasteful number, since it uses less digits than its factorization.

11011221222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515436.

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

Adding to 11011221222221 its reverse (12222212211011), we get a palindrome (23233433433232).

The spelling of 11011221222221 in words is "eleven trillion, eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".