242527721 has 4 divisors (see below), whose sum is σ = 242565444. Its totient is φ = 242490000.

The previous prime is 242527673. The next prime is 242527741. The reversal of 242527721 is 127725242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172554496 + 69973225 = 13136^2 + 8365^2 .

It is a cyclic number.

It is not a de Polignac number, because 242527721 - 2⁶ = 242527657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (242527741) 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 in 3 ways as a sum of consecutive naturals, for example, 6530 + ... + 22971.

It is an arithmetic number, because the mean of its divisors is an integer number (60641361).

Almost surely, 2^242527721 is an apocalyptic number.

It is an amenable number.

242527721 is a deficient number, since it is larger than the sum of its proper divisors (37723).

242527721 is an equidigital number, since it uses as much as digits as its factorization.

242527721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37722.

The product of its digits is 15680, while the sum is 32.

The square root of 242527721 is about 15573.3015446308. The cubic root of 242527721 is about 623.6206131601.

The spelling of 242527721 in words is "two hundred forty-two million, five hundred twenty-seven thousand, seven hundred twenty-one".