242021513 has 4 divisors (see below), whose sum is σ = 242456580. Its totient is φ = 241586448.

The previous prime is 242021509. The next prime is 242021519. The reversal of 242021513 is 315120242.

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 124255609 + 117765904 = 11147^2 + 10852^2 .

It is a cyclic number.

It is not a de Polignac number, because 242021513 - 2² = 242021509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242021519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216698 + ... + 217811.

It is an arithmetic number, because the mean of its divisors is an integer number (60614145).

Almost surely, 2^242021513 is an apocalyptic number.

It is an amenable number.

242021513 is a deficient number, since it is larger than the sum of its proper divisors (435067).

242021513 is an equidigital number, since it uses as much as digits as its factorization.

242021513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435066.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 242021513 is about 15557.0406247461. The cubic root of 242021513 is about 623.1864337473.

Adding to 242021513 its reverse (315120242), we get a palindrome (557141755).

The spelling of 242021513 in words is "two hundred forty-two million, twenty-one thousand, five hundred thirteen".