242415421 has 4 divisors (see below), whose sum is σ = 242774172. Its totient is φ = 242056672.

The previous prime is 242415419. The next prime is 242415431. The reversal of 242415421 is 124514242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124514242 = 2 ⋅62257121.

It can be written as a sum of positive squares in 2 ways, for example, as 184579396 + 57836025 = 13586^2 + 7605^2 .

It is a cyclic number.

It is not a de Polignac number, because 242415421 - 2¹ = 242415419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242415431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178360 + ... + 179713.

It is an arithmetic number, because the mean of its divisors is an integer number (60693543).

Almost surely, 2^242415421 is an apocalyptic number.

It is an amenable number.

242415421 is a deficient number, since it is larger than the sum of its proper divisors (358751).

242415421 is an equidigital number, since it uses as much as digits as its factorization.

242415421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358750.

The product of its digits is 2560, while the sum is 25.

The square root of 242415421 is about 15569.6955975382. The cubic root of 242415421 is about 623.5243445677.

Adding to 242415421 its reverse (124514242), we get a palindrome (366929663).

The spelling of 242415421 in words is "two hundred forty-two million, four hundred fifteen thousand, four hundred twenty-one".