242605221 has 8 divisors (see below), whose sum is σ = 329577120. Its totient is φ = 158685072.

The previous prime is 242605201. The next prime is 242605261. The reversal of 242605221 is 122506242.

It is a happy number.

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

It is not a de Polignac number, because 242605221 - 2⁷ = 242605093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 242605191 and 242605200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242605201) 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, 762751 + ... + 763068.

It is an arithmetic number, because the mean of its divisors is an integer number (41197140).

Almost surely, 2^242605221 is an apocalyptic number.

It is an amenable number.

242605221 is a deficient number, since it is larger than the sum of its proper divisors (86971899).

242605221 is a wasteful number, since it uses less digits than its factorization.

242605221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525875.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 242605221 is about 15575.7895787019. The cubic root of 242605221 is about 623.6870323034.

The spelling of 242605221 in words is "two hundred forty-two million, six hundred five thousand, two hundred twenty-one".