11111011220221 has 8 divisors (see below), whose sum is σ = 12121128424800. Its totient is φ = 10100898228240.

The previous prime is 11111011220201. The next prime is 11111011220251. The reversal of 11111011220221 is 12202211011111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111011220221 - 2¹⁵ = 11111011187453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111011220195 and 11111011220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111011220201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7439250 + ... + 8807068.

It is an arithmetic number, because the mean of its divisors is an integer number (1515141053100).

Almost surely, 2^{11111011220221} is an apocalyptic number.

11111011220221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111011220221 is a deficient number, since it is larger than the sum of its proper divisors (1010117204579).

11111011220221 is a wasteful number, since it uses less digits than its factorization.

11111011220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106299.

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

Adding to 11111011220221 its reverse (12202211011111), we get a palindrome (23313222231332).

The spelling of 11111011220221 in words is "eleven trillion, one hundred eleven billion, eleven million, two hundred twenty thousand, two hundred twenty-one".