11102221221221 has 8 divisors (see below), whose sum is σ = 11956713930840. Its totient is φ = 10247796467712.

The previous prime is 11102221221211. The next prime is 11102221221233. The reversal of 11102221221221 is 12212212220111.

It can be written as a sum of positive squares in 4 ways, for example, as 228622641025 + 10873598580196 = 478145^2 + 3297514^2 .

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 11102221221221 - 2³⁴ = 11085041352037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11102221221193 and 11102221221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11102221221211) 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, 16649456 + ... + 17303433.

It is an arithmetic number, because the mean of its divisors is an integer number (1494589241355).

Almost surely, 2^{11102221221221} is an apocalyptic number.

It is an amenable number.

11102221221221 is a deficient number, since it is larger than the sum of its proper divisors (854492709619).

11102221221221 is a wasteful number, since it uses less digits than its factorization.

11102221221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33978055.

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

Adding to 11102221221221 its reverse (12212212220111), we get a palindrome (23314433441332).

It can be divided in two parts, 11102 and 221221221, that multiplied together give a palindrome (2455997995542).

The spelling of 11102221221221 in words is "eleven trillion, one hundred two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".