321125521 has 2 divisors, whose sum is σ = 321125522. Its totient is φ = 321125520.

The previous prime is 321125513. The next prime is 321125537. The reversal of 321125521 is 125521123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294499921 + 26625600 = 17161^2 + 5160^2 .

It is a cyclic number.

It is not a de Polignac number, because 321125521 - 2³ = 321125513 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 321125492 and 321125501.

It is not a weakly prime, because it can be changed into another prime (321125551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160562760 + 160562761.

It is an arithmetic number, because the mean of its divisors is an integer number (160562761).

Almost surely, 2^321125521 is an apocalyptic number.

It is an amenable number.

321125521 is a deficient number, since it is larger than the sum of its proper divisors (1).

321125521 is an equidigital number, since it uses as much as digits as its factorization.

321125521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 22.

The square root of 321125521 is about 17919.9754743136. The cubic root of 321125521 is about 684.7913627478.

Adding to 321125521 its reverse (125521123), we get a palindrome (446646644).

The spelling of 321125521 in words is "three hundred twenty-one million, one hundred twenty-five thousand, five hundred twenty-one".