11101221221 has 8 divisors (see below), whose sum is σ = 11756024280. Its totient is φ = 10446617088.

The previous prime is 11101221191. The next prime is 11101221227. The reversal of 11101221221 is 12212210111.

It can be written as a sum of positive squares in 4 ways, for example, as 3830248321 + 7270972900 = 61889^2 + 85270^2 .

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 11101221221 - 2¹⁰ = 11101220197 is a prime.

It is a super-2 number, since 2×11101221221² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11101221196 and 11101221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101221227) 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, 73985 + ... + 166361.

It is an arithmetic number, because the mean of its divisors is an integer number (1469503035).

Almost surely, 2^11101221221 is an apocalyptic number.

It is an amenable number.

11101221221 is a deficient number, since it is larger than the sum of its proper divisors (654803059).

11101221221 is an equidigital number, since it uses as much as digits as its factorization.

11101221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99463.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11101221221 its reverse (12212210111), we get a palindrome (23313431332).

The spelling of 11101221221 in words is "eleven billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty-one".