245131203221 has 2 divisors, whose sum is σ = 245131203222. Its totient is φ = 245131203220.

The previous prime is 245131203211. The next prime is 245131203257. The reversal of 245131203221 is 122302131542.

245131203221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237651375025 + 7479828196 = 487495^2 + 86486^2 .

It is a cyclic number.

It is not a de Polignac number, because 245131203221 - 2⁶ = 245131203157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245131203211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122565601610 + 122565601611.

It is an arithmetic number, because the mean of its divisors is an integer number (122565601611).

Almost surely, 2^245131203221 is an apocalyptic number.

It is an amenable number.

245131203221 is a deficient number, since it is larger than the sum of its proper divisors (1).

245131203221 is an equidigital number, since it uses as much as digits as its factorization.

245131203221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 245131203221 its reverse (122302131542), we get a palindrome (367433334763).

The spelling of 245131203221 in words is "two hundred forty-five billion, one hundred thirty-one million, two hundred three thousand, two hundred twenty-one".