11222211202121 has 8 divisors (see below), whose sum is σ = 12045113072424. Its totient is φ = 10417395087360.

The previous prime is 11222211202073. The next prime is 11222211202141. The reversal of 11222211202121 is 12120211222211.

It can be written as a sum of positive squares in 4 ways, for example, as 2858344760896 + 8363866441225 = 1690664^2 + 2892035^2 .

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 11222211202121 - 2¹⁴ = 11222211185737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222211202093 and 11222211202102.

It is not an unprimeable number, because it can be changed into a prime (11222211202141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4521437600 + ... + 4521440081.

It is an arithmetic number, because the mean of its divisors is an integer number (1505639134053).

Almost surely, 2^{11222211202121} is an apocalyptic number.

It is an amenable number.

11222211202121 is a deficient number, since it is larger than the sum of its proper divisors (822901870303).

11222211202121 is an equidigital number, since it uses as much as digits as its factorization.

11222211202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9042877771.

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

Adding to 11222211202121 its reverse (12120211222211), we get a palindrome (23342422424332).

The spelling of 11222211202121 in words is "eleven trillion, two hundred twenty-two billion, two hundred eleven million, two hundred two thousand, one hundred twenty-one".