1321250133 has 32 divisors (see below), whose sum is σ = 2068819200. Its totient is φ = 734307840.

The previous prime is 1321250093. The next prime is 1321250143. The reversal of 1321250133 is 3310521231.

It is not a de Polignac number, because 1321250133 - 2¹² = 1321246037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321250143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 298291 + ... + 302687.

It is an arithmetic number, because the mean of its divisors is an integer number (64650600).

Almost surely, 2^1321250133 is an apocalyptic number.

It is an amenable number.

1321250133 is a deficient number, since it is larger than the sum of its proper divisors (747569067).

1321250133 is a wasteful number, since it uses less digits than its factorization.

1321250133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4797.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1321250133 is about 36349.0045668379. The cubic root of 1321250133 is about 1097.3075011029.

Adding to 1321250133 its reverse (3310521231), we get a palindrome (4631771364).

The spelling of 1321250133 in words is "one billion, three hundred twenty-one million, two hundred fifty thousand, one hundred thirty-three".