120312321 has 4 divisors (see below), whose sum is σ = 160416432. Its totient is φ = 80208212.

The previous prime is 120312289. The next prime is 120312359. The reversal of 120312321 is 123213021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 123213021 = 3 ⋅41071007.

It is a cyclic number.

It is not a de Polignac number, because 120312321 - 2⁵ = 120312289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120312321.

It is not an unprimeable number, because it can be changed into a prime (120312121) 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, 20052051 + ... + 20052056.

It is an arithmetic number, because the mean of its divisors is an integer number (40104108).

Almost surely, 2^120312321 is an apocalyptic number.

It is an amenable number.

120312321 is a deficient number, since it is larger than the sum of its proper divisors (40104111).

120312321 is an equidigital number, since it uses as much as digits as its factorization.

120312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40104110.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 120312321 is about 10968.6973246598. The cubic root of 120312321 is about 493.6699607267.

Adding to 120312321 its reverse (123213021), we get a palindrome (243525342).

The spelling of 120312321 in words is "one hundred twenty million, three hundred twelve thousand, three hundred twenty-one".