1321000133 has 4 divisors (see below), whose sum is σ = 1321459020. Its totient is φ = 1320541248.

The previous prime is 1321000129. The next prime is 1321000217. The reversal of 1321000133 is 3310001231.

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 525647329 + 795352804 = 22927^2 + 28202^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321000133 - 2² = 1321000129 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 (1321000333) 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, 225098 + ... + 230891.

It is an arithmetic number, because the mean of its divisors is an integer number (330364755).

Almost surely, 2^1321000133 is an apocalyptic number.

It is an amenable number.

1321000133 is a deficient number, since it is larger than the sum of its proper divisors (458887).

1321000133 is an equidigital number, since it uses as much as digits as its factorization.

1321000133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458886.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 1321000133 is about 36345.5655204318. The cubic root of 1321000133 is about 1097.2382878196.

Adding to 1321000133 its reverse (3310001231), we get a palindrome (4631001364).

The spelling of 1321000133 in words is "one billion, three hundred twenty-one million, one hundred thirty-three", and thus it is an aban number.