242311521 has 4 divisors (see below), whose sum is σ = 323082032. Its totient is φ = 161541012.

The previous prime is 242311519. The next prime is 242311549. The reversal of 242311521 is 125113242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 242311521 - 2¹ = 242311519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242311561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40385251 + ... + 40385256.

It is an arithmetic number, because the mean of its divisors is an integer number (80770508).

Almost surely, 2^242311521 is an apocalyptic number.

It is an amenable number.

242311521 is a deficient number, since it is larger than the sum of its proper divisors (80770511).

242311521 is an equidigital number, since it uses as much as digits as its factorization.

242311521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80770510.

The product of its digits is 480, while the sum is 21.

The square root of 242311521 is about 15566.3586300715. The cubic root of 242311521 is about 623.4352503496.

Adding to 242311521 its reverse (125113242), we get a palindrome (367424763).

It can be divided in two parts, 24231 and 1521, that added together give a palindrome (25752).

The spelling of 242311521 in words is "two hundred forty-two million, three hundred eleven thousand, five hundred twenty-one".