321120403 has 4 divisors (see below), whose sum is σ = 327952800. Its totient is φ = 314288008.

The previous prime is 321120379. The next prime is 321120419. The reversal of 321120403 is 304021123.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321120403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321120473) 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, 3416128 + ... + 3416221.

It is an arithmetic number, because the mean of its divisors is an integer number (81988200).

Almost surely, 2^321120403 is an apocalyptic number.

321120403 is a deficient number, since it is larger than the sum of its proper divisors (6832397).

321120403 is an equidigital number, since it uses as much as digits as its factorization.

321120403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6832396.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 321120403 is about 17919.8326722099. The cubic root of 321120403 is about 684.7877247302.

Adding to 321120403 its reverse (304021123), we get a palindrome (625141526).

The spelling of 321120403 in words is "three hundred twenty-one million, one hundred twenty thousand, four hundred three".