1321432133 has 16 divisors (see below), whose sum is σ = 1626710016. Its totient is φ = 1048457520.

The previous prime is 1321432061. The next prime is 1321432139. The reversal of 1321432133 is 3312341231.

It is a cyclic number.

It is not a de Polignac number, because 1321432133 - 2⁸ = 1321431877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321432099 and 1321432108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321432139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127391 + ... + 137372.

It is an arithmetic number, because the mean of its divisors is an integer number (101669376).

Almost surely, 2^1321432133 is an apocalyptic number.

It is an amenable number.

1321432133 is a deficient number, since it is larger than the sum of its proper divisors (305277883).

1321432133 is a wasteful number, since it uses less digits than its factorization.

1321432133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264824.

The product of its digits is 1296, while the sum is 23.

The square root of 1321432133 is about 36351.5079879776. The cubic root of 1321432133 is about 1097.3578828817.

Adding to 1321432133 its reverse (3312341231), we get a palindrome (4633773364).

The spelling of 1321432133 in words is "one billion, three hundred twenty-one million, four hundred thirty-two thousand, one hundred thirty-three".