1321231133 has 4 divisors (see below), whose sum is σ = 1321948320. Its totient is φ = 1320513948.

The previous prime is 1321231099. The next prime is 1321231141. The reversal of 1321231133 is 3311321231.

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.

It is a cyclic number.

It is not a de Polignac number, because 1321231133 - 2¹⁰ = 1321230109 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 (1321231733) 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, 355823 + ... + 359516.

It is an arithmetic number, because the mean of its divisors is an integer number (330487080).

Almost surely, 2^1321231133 is an apocalyptic number.

It is an amenable number.

1321231133 is a deficient number, since it is larger than the sum of its proper divisors (717187).

1321231133 is an equidigital number, since it uses as much as digits as its factorization.

1321231133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717186.

The product of its digits is 324, while the sum is 20.

The square root of 1321231133 is about 36348.7432107356. The cubic root of 1321231133 is about 1097.3022411999.

Adding to 1321231133 its reverse (3311321231), we get a palindrome (4632552364).

The spelling of 1321231133 in words is "one billion, three hundred twenty-one million, two hundred thirty-one thousand, one hundred thirty-three".