242306521 has 2 divisors, whose sum is σ = 242306522. Its totient is φ = 242306520.

The previous prime is 242306501. The next prime is 242306527. The reversal of 242306521 is 125603242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142086400 + 100220121 = 11920^2 + 10011^2 .

It is a cyclic number.

It is not a de Polignac number, because 242306521 - 2²¹ = 240209369 is a prime.

It is not a weakly prime, because it can be changed into another prime (242306527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121153260 + 121153261.

It is an arithmetic number, because the mean of its divisors is an integer number (121153261).

Almost surely, 2^242306521 is an apocalyptic number.

It is an amenable number.

242306521 is a deficient number, since it is larger than the sum of its proper divisors (1).

242306521 is an equidigital number, since it uses as much as digits as its factorization.

242306521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 242306521 is about 15566.1980264932. The cubic root of 242306521 is about 623.4309622089.

Adding to 242306521 its reverse (125603242), we get a palindrome (367909763).

The spelling of 242306521 in words is "two hundred forty-two million, three hundred six thousand, five hundred twenty-one".