321043021 has 8 divisors (see below), whose sum is σ = 357661080. Its totient is φ = 286128192.

The previous prime is 321042983. The next prime is 321043049. The reversal of 321043021 is 120340123.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9696996 + 311346025 = 3114^2 + 17645^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321043021 - 2⁷ = 321042893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321042986 and 321043004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321043081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425410 + ... + 426163.

It is an arithmetic number, because the mean of its divisors is an integer number (44707635).

Almost surely, 2^321043021 is an apocalyptic number.

It is an amenable number.

321043021 is a deficient number, since it is larger than the sum of its proper divisors (36618059).

321043021 is a wasteful number, since it uses less digits than its factorization.

321043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851615.

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

The square root of 321043021 is about 17917.6734259781. The cubic root of 321043021 is about 684.7327147296.

Adding to 321043021 its reverse (120340123), we get a palindrome (441383144).

The spelling of 321043021 in words is "three hundred twenty-one million, forty-three thousand, twenty-one".