1122211226221 has 2 divisors, whose sum is σ = 1122211226222. Its totient is φ = 1122211226220.

The previous prime is 1122211226209. The next prime is 1122211226237. The reversal of 1122211226221 is 1226221122211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 816113492100 + 306097734121 = 903390^2 + 553261^2 .

It is an emirp because it is prime and its reverse (1226221122211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1122211226221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1122211226251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561105613110 + 561105613111.

It is an arithmetic number, because the mean of its divisors is an integer number (561105613111).

Almost surely, 2^{1122211226221} is an apocalyptic number.

It is an amenable number.

1122211226221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122211226221 is an equidigital number, since it uses as much as digits as its factorization.

1122211226221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

Adding to 1122211226221 its reverse (1226221122211), we get a palindrome (2348432348432).

The spelling of 1122211226221 in words is "one trillion, one hundred twenty-two billion, two hundred eleven million, two hundred twenty-six thousand, two hundred twenty-one".