345325021 has 2 divisors, whose sum is σ = 345325022. Its totient is φ = 345325020.

The previous prime is 345325009. The next prime is 345325061. The reversal of 345325021 is 120523543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235284921 + 110040100 = 15339^2 + 10490^2 .

It is a cyclic number.

It is not a de Polignac number, because 345325021 - 2¹¹ = 345322973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345325061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172662510 + 172662511.

It is an arithmetic number, because the mean of its divisors is an integer number (172662511).

Almost surely, 2^345325021 is an apocalyptic number.

It is an amenable number.

345325021 is a deficient number, since it is larger than the sum of its proper divisors (1).

345325021 is an equidigital number, since it uses as much as digits as its factorization.

345325021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 345325021 is about 18582.9228325363. The cubic root of 345325021 is about 701.5780866119.

Adding to 345325021 its reverse (120523543), we get a palindrome (465848564).

The spelling of 345325021 in words is "three hundred forty-five million, three hundred twenty-five thousand, twenty-one".