1101221311 has 2 divisors, whose sum is σ = 1101221312. Its totient is φ = 1101221310.

The previous prime is 1101221197. The next prime is 1101221377. The reversal of 1101221311 is 1131221011.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (1131221011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1101221311 - 2¹¹ = 1101219263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1101221291 and 1101221300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1101221111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550610655 + 550610656.

It is an arithmetic number, because the mean of its divisors is an integer number (550610656).

Almost surely, 2^1101221311 is an apocalyptic number.

1101221311 is a deficient number, since it is larger than the sum of its proper divisors (1).

1101221311 is an equidigital number, since it uses as much as digits as its factorization.

1101221311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1101221311 is about 33184.6547518578. The cubic root of 1101221311 is about 1032.6620150797.

Adding to 1101221311 its reverse (1131221011), we get a palindrome (2232442322).

It can be divided in two parts, 11012 and 21311, that added together give a palindrome (32323).

The spelling of 1101221311 in words is "one billion, one hundred one million, two hundred twenty-one thousand, three hundred eleven".