11122221201221 has 8 divisors (see below), whose sum is σ = 11977920762360. Its totient is φ = 10266542223552.

The previous prime is 11122221201209. The next prime is 11122221201233. The reversal of 11122221201221 is 12210212222111.

It is an interprime number because it is at equal distance from previous prime (11122221201209) and next prime (11122221201233).

It can be written as a sum of positive squares in 4 ways, for example, as 1530898917025 + 9591322284196 = 1237295^2 + 3096986^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11122221201221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11122221201193 and 11122221201202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11122221201121) 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, 4014386 + ... + 6193523.

It is an arithmetic number, because the mean of its divisors is an integer number (1497240095295).

Almost surely, 2^{11122221201221} is an apocalyptic number.

It is an amenable number.

11122221201221 is a deficient number, since it is larger than the sum of its proper divisors (855699561139).

11122221201221 is a wasteful number, since it uses less digits than its factorization.

11122221201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10291735.

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

Adding to 11122221201221 its reverse (12210212222111), we get a palindrome (23332433423332).

The spelling of 11122221201221 in words is "eleven trillion, one hundred twenty-two billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-one".