245204221 has 2 divisors, whose sum is σ = 245204222. Its totient is φ = 245204220.

The previous prime is 245204213. The next prime is 245204227. The reversal of 245204221 is 122402542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199911321 + 45292900 = 14139^2 + 6730^2 .

It is a cyclic number.

It is not a de Polignac number, because 245204221 - 2³ = 245204213 is a prime.

It is a super-3 number, since 3×245204221³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 245204192 and 245204201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245204227) 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, 122602110 + 122602111.

It is an arithmetic number, because the mean of its divisors is an integer number (122602111).

Almost surely, 2^245204221 is an apocalyptic number.

It is an amenable number.

245204221 is a deficient number, since it is larger than the sum of its proper divisors (1).

245204221 is an equidigital number, since it uses as much as digits as its factorization.

245204221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 245204221 is about 15658.9980841687. The cubic root of 245204221 is about 625.9062871147.

Adding to 245204221 its reverse (122402542), we get a palindrome (367606763).

The spelling of 245204221 in words is "two hundred forty-five million, two hundred four thousand, two hundred twenty-one".