242521807 has 4 divisors (see below), whose sum is σ = 264569256. Its totient is φ = 220474360.

The previous prime is 242521781. The next prime is 242521819. The reversal of 242521807 is 708125242.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 242521807 - 2¹⁹ = 241997519 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242521207) 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 3 ways as a sum of consecutive naturals, for example, 11023708 + ... + 11023729.

It is an arithmetic number, because the mean of its divisors is an integer number (66142314).

Almost surely, 2^242521807 is an apocalyptic number.

242521807 is a deficient number, since it is larger than the sum of its proper divisors (22047449).

242521807 is a wasteful number, since it uses less digits than its factorization.

242521807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22047448.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 242521807 is about 15573.1116672295. Note that the first 3 decimals coincide. The cubic root of 242521807 is about 623.6155441556.

The spelling of 242521807 in words is "two hundred forty-two million, five hundred twenty-one thousand, eight hundred seven".