242215521 has 8 divisors (see below), whose sum is σ = 326089920. Its totient is φ = 159909072.

The previous prime is 242215513. The next prime is 242215531. The reversal of 242215521 is 125512242.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 242215521 - 2³ = 242215513 is a prime.

It is a super-2 number, since 2×242215521² = 117336717226602882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 242215491 and 242215500.

It is not an unprimeable number, because it can be changed into a prime (242215531) 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 7 ways as a sum of consecutive naturals, for example, 391626 + ... + 392243.

It is an arithmetic number, because the mean of its divisors is an integer number (40761240).

Almost surely, 2^242215521 is an apocalyptic number.

It is an amenable number.

242215521 is a deficient number, since it is larger than the sum of its proper divisors (83874399).

242215521 is a wasteful number, since it uses less digits than its factorization.

242215521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783975.

The product of its digits is 1600, while the sum is 24.

The square root of 242215521 is about 15563.2747517995. The cubic root of 242215521 is about 623.3529077391.

Adding to 242215521 its reverse (125512242), we get a palindrome (367727763).

The spelling of 242215521 in words is "two hundred forty-two million, two hundred fifteen thousand, five hundred twenty-one".