242021643 has 4 divisors (see below), whose sum is σ = 322695528. Its totient is φ = 161347760.

The previous prime is 242021641. The next prime is 242021651. The reversal of 242021643 is 346120242.

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 242021643 - 2¹ = 242021641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (242021641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40336938 + ... + 40336943.

It is an arithmetic number, because the mean of its divisors is an integer number (80673882).

Almost surely, 2^242021643 is an apocalyptic number.

242021643 is a deficient number, since it is larger than the sum of its proper divisors (80673885).

242021643 is an equidigital number, since it uses as much as digits as its factorization.

242021643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80673884.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 242021643 is about 15557.0448029181. The cubic root of 242021643 is about 623.1865453272.

Adding to 242021643 its reverse (346120242), we get a palindrome (588141885).

The spelling of 242021643 in words is "two hundred forty-two million, twenty-one thousand, six hundred forty-three".