321121243 has 4 divisors (see below), whose sum is σ = 322371000. Its totient is φ = 319871488.

The previous prime is 321121189. The next prime is 321121259. The reversal of 321121243 is 342121123.

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-321121243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321121243.

It is not an unprimeable number, because it can be changed into a prime (321121643) 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, 624493 + ... + 625006.

It is an arithmetic number, because the mean of its divisors is an integer number (80592750).

Almost surely, 2^321121243 is an apocalyptic number.

321121243 is a deficient number, since it is larger than the sum of its proper divisors (1249757).

321121243 is a wasteful number, since it uses less digits than its factorization.

321121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249756.

The product of its digits is 288, while the sum is 19.

The square root of 321121243 is about 17919.8561099134. The cubic root of 321121243 is about 684.7883218284.

Adding to 321121243 its reverse (342121123), we get a palindrome (663242366).

The spelling of 321121243 in words is "three hundred twenty-one million, one hundred twenty-one thousand, two hundred forty-three".