242222521 has 8 divisors (see below), whose sum is σ = 246476288. Its totient is φ = 237978000.

The previous prime is 242222509. The next prime is 242222531. The reversal of 242222521 is 125222242.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242222521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242222492 and 242222501.

It is not an unprimeable number, because it can be changed into a prime (242222531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69736 + ... + 73126.

It is an arithmetic number, because the mean of its divisors is an integer number (30809536).

Almost surely, 2^242222521 is an apocalyptic number.

It is an amenable number.

242222521 is a deficient number, since it is larger than the sum of its proper divisors (4253767).

242222521 is a wasteful number, since it uses less digits than its factorization.

242222521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4623.

The product of its digits is 1280, while the sum is 22.

The square root of 242222521 is about 15563.4996385774. The cubic root of 242222521 is about 623.3589126231.

Adding to 242222521 its reverse (125222242), we get a palindrome (367444763).

The spelling of 242222521 in words is "two hundred forty-two million, two hundred twenty-two thousand, five hundred twenty-one".