75231321 has 16 divisors (see below), whose sum is σ = 114186240. Its totient is φ = 43611920.

The previous prime is 75231319. The next prime is 75231347. The reversal of 75231321 is 12313257.

It is not a de Polignac number, because 75231321 - 2¹ = 75231319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75231291 and 75231300.

It is not an unprimeable number, because it can be changed into a prime (75231521) 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, 48801 + ... + 50318.

It is an arithmetic number, because the mean of its divisors is an integer number (7136640).

Almost surely, 2^75231321 is an apocalyptic number.

It is an amenable number.

75231321 is a deficient number, since it is larger than the sum of its proper divisors (38954919).

75231321 is a wasteful number, since it uses less digits than its factorization.

75231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99156.

The product of its digits is 1260, while the sum is 24.

The square root of 75231321 is about 8673.5990799667. The cubic root of 75231321 is about 422.1494514192.

Adding to 75231321 its reverse (12313257), we get a palindrome (87544578).

The spelling of 75231321 in words is "seventy-five million, two hundred thirty-one thousand, three hundred twenty-one".