11222210211221 has 2 divisors, whose sum is σ = 11222210211222. Its totient is φ = 11222210211220.

The previous prime is 11222210211211. The next prime is 11222210211229. The reversal of 11222210211221 is 12211201222211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10161042394321 + 1061167816900 = 3187639^2 + 1030130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11222210211221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11222210211193 and 11222210211202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11222210211229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611105105610 + 5611105105611.

It is an arithmetic number, because the mean of its divisors is an integer number (5611105105611).

Almost surely, 2^{11222210211221} is an apocalyptic number.

It is an amenable number.

11222210211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222210211221 is an equidigital number, since it uses as much as digits as its factorization.

11222210211221 is an evil number, because the sum of its binary digits is even.

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

Adding to 11222210211221 its reverse (12211201222211), we get a palindrome (23433411433432).

The spelling of 11222210211221 in words is "eleven trillion, two hundred twenty-two billion, two hundred ten million, two hundred eleven thousand, two hundred twenty-one".