242153321 has 4 divisors (see below), whose sum is σ = 256397652. Its totient is φ = 227908992.

The previous prime is 242153297. The next prime is 242153323. The reversal of 242153321 is 123351242.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 211295296 + 30858025 = 14536^2 + 5555^2 .

It is a cyclic number.

It is not a de Polignac number, because 242153321 - 2²² = 237959017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (242153323) 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, 7122140 + ... + 7122173.

It is an arithmetic number, because the mean of its divisors is an integer number (64099413).

Almost surely, 2^242153321 is an apocalyptic number.

It is an amenable number.

242153321 is a deficient number, since it is larger than the sum of its proper divisors (14244331).

242153321 is a wasteful number, since it uses less digits than its factorization.

242153321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14244330.

The product of its digits is 1440, while the sum is 23.

The square root of 242153321 is about 15561.2763294018. The cubic root of 242153321 is about 623.2995449735.

The spelling of 242153321 in words is "two hundred forty-two million, one hundred fifty-three thousand, three hundred twenty-one".