11001222011221 has 4 divisors (see below), whose sum is σ = 11847469858252. Its totient is φ = 10154974164192.

The previous prime is 11001222011167. The next prime is 11001222011309. The reversal of 11001222011221 is 12211022210011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3296544978321 + 7704677032900 = 1815639^2 + 2775730^2 .

It is not a de Polignac number, because 11001222011221 - 2²⁵ = 11001188456789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001222011195 and 11001222011204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001222041221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423123923496 + ... + 423123923521.

It is an arithmetic number, because the mean of its divisors is an integer number (2961867464563).

Almost surely, 2^{11001222011221} is an apocalyptic number.

It is an amenable number.

11001222011221 is a deficient number, since it is larger than the sum of its proper divisors (846247847031).

11001222011221 is an equidigital number, since it uses as much as digits as its factorization.

11001222011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846247847030.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 11001222011221 its reverse (12211022210011), we get a palindrome (23212244221232).

The spelling of 11001222011221 in words is "eleven trillion, one billion, two hundred twenty-two million, eleven thousand, two hundred twenty-one".