52400321 has 2 divisors, whose sum is σ = 52400322. Its totient is φ = 52400320.

The previous prime is 52400311. The next prime is 52400329. The reversal of 52400321 is 12300425.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47059600 + 5340721 = 6860^2 + 2311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52400321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52400321.

It is not a weakly prime, because it can be changed into another prime (52400329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26200160 + 26200161.

It is an arithmetic number, because the mean of its divisors is an integer number (26200161).

Almost surely, 2^52400321 is an apocalyptic number.

It is an amenable number.

52400321 is a deficient number, since it is larger than the sum of its proper divisors (1).

52400321 is an equidigital number, since it uses as much as digits as its factorization.

52400321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 52400321 is about 7238.8066005385. The cubic root of 52400321 is about 374.2064903940.

Adding to 52400321 its reverse (12300425), we get a palindrome (64700746).

The spelling of 52400321 in words is "fifty-two million, four hundred thousand, three hundred twenty-one".