1101101221 has 4 divisors (see below), whose sum is σ = 1201201344. Its totient is φ = 1001001100.

The previous prime is 1101101219. The next prime is 1101101227. The reversal of 1101101221 is 1221011011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1221011011 = 11 ⋅111001001.

It is not a de Polignac number, because 1101101221 - 2¹ = 1101101219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101101198 and 1101101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101101227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50050045 + ... + 50050066.

It is an arithmetic number, because the mean of its divisors is an integer number (300300336).

Almost surely, 2^1101101221 is an apocalyptic number.

1101101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1101101221 is a deficient number, since it is larger than the sum of its proper divisors (100100123).

1101101221 is a wasteful number, since it uses less digits than its factorization.

1101101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100100122.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1101101221 is about 33182.8452818621. The cubic root of 1101101221 is about 1032.6244758832.

Adding to 1101101221 its reverse (1221011011), we get a palindrome (2322112232).

The spelling of 1101101221 in words is "one billion, one hundred one million, one hundred one thousand, two hundred twenty-one".