1101131321 has 4 divisors (see below), whose sum is σ = 1101201444. Its totient is φ = 1101061200.

The previous prime is 1101131281. The next prime is 1101131323. The reversal of 1101131321 is 1231311011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1231311011 = 7 ⋅175901573.

It can be written as a sum of positive squares in 2 ways, for example, as 975937600 + 125193721 = 31240^2 + 11189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1101131321 - 2⁶ = 1101131257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1101131296 and 1101131305.

It is not an unprimeable number, because it can be changed into a prime (1101131323) 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, 551 + ... + 46931.

It is an arithmetic number, because the mean of its divisors is an integer number (275300361).

Almost surely, 2^1101131321 is an apocalyptic number.

It is an amenable number.

1101131321 is a deficient number, since it is larger than the sum of its proper divisors (70123).

1101131321 is an equidigital number, since it uses as much as digits as its factorization.

1101131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70122.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1101131321 is about 33183.2988263675. The cubic root of 1101131321 is about 1032.6338851645.

Adding to 1101131321 its reverse (1231311011), we get a palindrome (2332442332).

The spelling of 1101131321 in words is "one billion, one hundred one million, one hundred thirty-one thousand, three hundred twenty-one".