242021505 has 16 divisors (see below), whose sum is σ = 422437824. Its totient is φ = 117343680.

The previous prime is 242021491. The next prime is 242021509. The reversal of 242021505 is 505120242.

It is a happy number.

242021505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 242021505 - 2⁴ = 242021489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (242021509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 733234 + ... + 733563.

It is an arithmetic number, because the mean of its divisors is an integer number (26402364).

Almost surely, 2^242021505 is an apocalyptic number.

It is an amenable number.

242021505 is a deficient number, since it is larger than the sum of its proper divisors (180416319).

242021505 is a wasteful number, since it uses less digits than its factorization.

242021505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466816.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 242021505 is about 15557.0403676278. The cubic root of 242021505 is about 623.1864268808.

Adding to 242021505 its reverse (505120242), we get a palindrome (747141747).

The spelling of 242021505 in words is "two hundred forty-two million, twenty-one thousand, five hundred five".