1101331221 has 4 divisors (see below), whose sum is σ = 1468441632. Its totient is φ = 734220812.

The previous prime is 1101331211. The next prime is 1101331223. The reversal of 1101331221 is 1221331011.

It is a happy number.

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: 1221331011 = 3 ⋅407110337.

It is a cyclic number.

It is not a de Polignac number, because 1101331221 - 2⁶ = 1101331157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1101331221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101331223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183555201 + ... + 183555206.

It is an arithmetic number, because the mean of its divisors is an integer number (367110408).

Almost surely, 2^1101331221 is an apocalyptic number.

It is an amenable number.

1101331221 is a deficient number, since it is larger than the sum of its proper divisors (367110411).

1101331221 is an equidigital number, since it uses as much as digits as its factorization.

1101331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367110410.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1101331221 is about 33186.3107470535. The cubic root of 1101331221 is about 1032.6963696958.

Adding to 1101331221 its reverse (1221331011), we get a palindrome (2322662232).

It can be divided in two parts, 110 and 1331221, that added together give a palindrome (1331331).

The spelling of 1101331221 in words is "one billion, one hundred one million, three hundred thirty-one thousand, two hundred twenty-one".