238842221 has 4 divisors (see below), whose sum is σ = 243348732. Its totient is φ = 234335712.

The previous prime is 238842199. The next prime is 238842223. The reversal of 238842221 is 122248832.

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 99720196 + 139122025 = 9986^2 + 11795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238842221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238842223) 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, 2253176 + ... + 2253281.

It is an arithmetic number, because the mean of its divisors is an integer number (60837183).

Almost surely, 2^238842221 is an apocalyptic number.

It is an amenable number.

238842221 is a deficient number, since it is larger than the sum of its proper divisors (4506511).

238842221 is an equidigital number, since it uses as much as digits as its factorization.

238842221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4506510.

The product of its digits is 12288, while the sum is 32.

The square root of 238842221 is about 15454.5210537241. The cubic root of 238842221 is about 620.4455875925.

The spelling of 238842221 in words is "two hundred thirty-eight million, eight hundred forty-two thousand, two hundred twenty-one".