11111322123221 has 2 divisors, whose sum is σ = 11111322123222. Its totient is φ = 11111322123220.

The previous prime is 11111322123197. The next prime is 11111322123283. The reversal of 11111322123221 is 12232122311111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7255750322500 + 3855571800721 = 2693650^2 + 1963561^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111322123221 - 2⁴² = 6713275612117 is a prime.

It is a super-2 number, since 2×11111322123221² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111322125221) 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 as a sum of consecutive naturals, namely, 5555661061610 + 5555661061611.

It is an arithmetic number, because the mean of its divisors is an integer number (5555661061611).

Almost surely, 2^{11111322123221} is an apocalyptic number.

It is an amenable number.

11111322123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111322123221 is an equidigital number, since it uses as much as digits as its factorization.

11111322123221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

Adding to 11111322123221 its reverse (12232122311111), we get a palindrome (23343444434332).

The spelling of 11111322123221 in words is "eleven trillion, one hundred eleven billion, three hundred twenty-two million, one hundred twenty-three thousand, two hundred twenty-one".