242004515021 has 4 divisors (see below), whose sum is σ = 242225929212. Its totient is φ = 241783100832.

The previous prime is 242004514987. The next prime is 242004515063. The reversal of 242004515021 is 120515400242.

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 160091212996 + 81913302025 = 400114^2 + 286205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242004515021 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 (242004515521) 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, 110705456 + ... + 110707641.

It is an arithmetic number, because the mean of its divisors is an integer number (60556482303).

Almost surely, 2^242004515021 is an apocalyptic number.

It is an amenable number.

242004515021 is a deficient number, since it is larger than the sum of its proper divisors (221414191).

242004515021 is a wasteful number, since it uses less digits than its factorization.

242004515021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221414190.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 242004515021 its reverse (120515400242), we get a palindrome (362519915263).

The spelling of 242004515021 in words is "two hundred forty-two billion, four million, five hundred fifteen thousand, twenty-one".