242305021 has 16 divisors (see below), whose sum is σ = 287170560. Its totient is φ = 200064240.

The previous prime is 242305009. The next prime is 242305033. The reversal of 242305021 is 120503242.

It is an interprime number because it is at equal distance from previous prime (242305009) and next prime (242305033).

It is a cyclic number.

It is not a de Polignac number, because 242305021 - 2¹⁹ = 241780733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242305021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242306021) 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, 46800 + ... + 51718.

It is an arithmetic number, because the mean of its divisors is an integer number (17948160).

Almost surely, 2^242305021 is an apocalyptic number.

It is an amenable number.

242305021 is a deficient number, since it is larger than the sum of its proper divisors (44865539).

242305021 is a wasteful number, since it uses less digits than its factorization.

242305021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5184.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 242305021 is about 15566.1498450966. The cubic root of 242305021 is about 623.4296757552.

Adding to 242305021 its reverse (120503242), we get a palindrome (362808263).

The spelling of 242305021 in words is "two hundred forty-two million, three hundred five thousand, twenty-one".