242240312021 has 4 divisors (see below), whose sum is σ = 242716226700. Its totient is φ = 241764397344.

The previous prime is 242240311991. The next prime is 242240312053. The reversal of 242240312021 is 120213042242.

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 200601868996 + 41638443025 = 447886^2 + 204055^2 .

It is a cyclic number.

It is not a de Polignac number, because 242240312021 - 2¹⁴ = 242240295637 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 (242240312081) 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, 237956576 + ... + 237957593.

It is an arithmetic number, because the mean of its divisors is an integer number (60679056675).

Almost surely, 2^242240312021 is an apocalyptic number.

It is an amenable number.

242240312021 is a deficient number, since it is larger than the sum of its proper divisors (475914679).

242240312021 is an equidigital number, since it uses as much as digits as its factorization.

242240312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475914678.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 242240312021 its reverse (120213042242), we get a palindrome (362453354263).

The spelling of 242240312021 in words is "two hundred forty-two billion, two hundred forty million, three hundred twelve thousand, twenty-one".