241221521 has 2 divisors, whose sum is σ = 241221522. Its totient is φ = 241221520.

The previous prime is 241221503. The next prime is 241221527. The reversal of 241221521 is 125122142.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205520896 + 35700625 = 14336^2 + 5975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-241221521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 241221493 and 241221502.

It is not a weakly prime, because it can be changed into another prime (241221527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120610760 + 120610761.

It is an arithmetic number, because the mean of its divisors is an integer number (120610761).

Almost surely, 2^241221521 is an apocalyptic number.

It is an amenable number.

241221521 is a deficient number, since it is larger than the sum of its proper divisors (1).

241221521 is an equidigital number, since it uses as much as digits as its factorization.

241221521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320, while the sum is 20.

The square root of 241221521 is about 15531.3077685042. The cubic root of 241221521 is about 622.4990368958.

Adding to 241221521 its reverse (125122142), we get a palindrome (366343663).

The spelling of 241221521 in words is "two hundred forty-one million, two hundred twenty-one thousand, five hundred twenty-one".