245143021 has 2 divisors, whose sum is σ = 245143022. Its totient is φ = 245143020.

The previous prime is 245143013. The next prime is 245143033. The reversal of 245143021 is 120341542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244766025 + 376996 = 15645^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 245143021 - 2³ = 245143013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 245142983 and 245143001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245143001) 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, 122571510 + 122571511.

It is an arithmetic number, because the mean of its divisors is an integer number (122571511).

Almost surely, 2^245143021 is an apocalyptic number.

It is an amenable number.

245143021 is a deficient number, since it is larger than the sum of its proper divisors (1).

245143021 is an equidigital number, since it uses as much as digits as its factorization.

245143021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 245143021 is about 15657.0438142071. The cubic root of 245143021 is about 625.8542099088.

Adding to 245143021 its reverse (120341542), we get a palindrome (365484563).

The spelling of 245143021 in words is "two hundred forty-five million, one hundred forty-three thousand, twenty-one".