1101222221 has 16 divisors (see below), whose sum is σ = 1254942720. Its totient is φ = 956532720.

The previous prime is 1101222193. The next prime is 1101222223. The reversal of 1101222221 is 1222221011.

It is not a de Polignac number, because 1101222221 - 2¹⁰ = 1101221197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101222196 and 1101222205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101222223) 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 15 ways as a sum of consecutive naturals, for example, 307640 + ... + 311198.

It is an arithmetic number, because the mean of its divisors is an integer number (78433920).

Almost surely, 2^1101222221 is an apocalyptic number.

1101222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1101222221 is a deficient number, since it is larger than the sum of its proper divisors (153720499).

1101222221 is a wasteful number, since it uses less digits than its factorization.

1101222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4816.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1101222221 is about 33184.6684630117. The cubic root of 1101222221 is about 1032.6622995281.

Adding to 1101222221 its reverse (1222221011), we get a palindrome (2323443232).

It can be divided in two parts, 11012 and 22221, that added together give a palindrome (33233).

The spelling of 1101222221 in words is "one billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty-one".