1321123311 has 32 divisors (see below), whose sum is σ = 2033930240. Its totient is φ = 846612000.

The previous prime is 1321123303. The next prime is 1321123337. The reversal of 1321123311 is 1133211231.

1321123311 is a `hidden beast` number, since 1 + 321 + 12 + 331 + 1 = 666.

It is not a de Polignac number, because 1321123311 - 2³ = 1321123303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321123301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121161 + ... + 131613.

It is an arithmetic number, because the mean of its divisors is an integer number (63560320).

Almost surely, 2^1321123311 is an apocalyptic number.

1321123311 is a deficient number, since it is larger than the sum of its proper divisors (712806929).

1321123311 is a wasteful number, since it uses less digits than its factorization.

1321123311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10644 (or 10638 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1321123311 is about 36347.2600205297. The cubic root of 1321123311 is about 1097.2723911260.

Adding to 1321123311 its reverse (1133211231), we get a palindrome (2454334542).

The spelling of 1321123311 in words is "one billion, three hundred twenty-one million, one hundred twenty-three thousand, three hundred eleven".