1131320322221 has 4 divisors (see below), whose sum is σ = 1152665988732. Its totient is φ = 1109974655712.

The previous prime is 1131320322203. The next prime is 1131320322241. The reversal of 1131320322221 is 1222230231311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 270852589225 + 860467732996 = 520435^2 + 927614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131320322221 - 2⁶ = 1131320322157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131320322241) 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, 10672833176 + ... + 10672833281.

It is an arithmetic number, because the mean of its divisors is an integer number (288166497183).

Almost surely, 2^{1131320322221} is an apocalyptic number.

It is an amenable number.

1131320322221 is a deficient number, since it is larger than the sum of its proper divisors (21345666511).

1131320322221 is an equidigital number, since it uses as much as digits as its factorization.

1131320322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21345666510.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1131320322221 its reverse (1222230231311), we get a palindrome (2353550553532).

It can be divided in two parts, 1131320 and 322221, that added together give a palindrome (1453541).

The spelling of 1131320322221 in words is "one trillion, one hundred thirty-one billion, three hundred twenty million, three hundred twenty-two thousand, two hundred twenty-one".