241220315521 has 2 divisors, whose sum is σ = 241220315522. Its totient is φ = 241220315520.

The previous prime is 241220315513. The next prime is 241220315527. The reversal of 241220315521 is 125513022142.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229172838400 + 12047477121 = 478720^2 + 109761^2 .

It is a cyclic number.

It is not a de Polignac number, because 241220315521 - 2³ = 241220315513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 241220315521.

It is not a weakly prime, because it can be changed into another prime (241220315527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120610157760 + 120610157761.

It is an arithmetic number, because the mean of its divisors is an integer number (120610157761).

Almost surely, 2^241220315521 is an apocalyptic number.

It is an amenable number.

241220315521 is a deficient number, since it is larger than the sum of its proper divisors (1).

241220315521 is an equidigital number, since it uses as much as digits as its factorization.

241220315521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 241220315521 its reverse (125513022142), we get a palindrome (366733337663).

The spelling of 241220315521 in words is "two hundred forty-one billion, two hundred twenty million, three hundred fifteen thousand, five hundred twenty-one".