242502021 has 6 divisors (see below), whose sum is σ = 350280710. Its totient is φ = 161668008.

The previous prime is 242501993. The next prime is 242502047. The reversal of 242502021 is 120205242.

It can be written as a sum of positive squares in only one way, i.e., 173844225 + 68657796 = 13185^2 + 8286^2 .

It is not a de Polignac number, because 242502021 - 2⁵ = 242501989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242501985 and 242502003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242502061) 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 5 ways as a sum of consecutive naturals, for example, 13472326 + ... + 13472343.

Almost surely, 2^242502021 is an apocalyptic number.

It is an amenable number.

242502021 is a deficient number, since it is larger than the sum of its proper divisors (107778689).

242502021 is a wasteful number, since it uses less digits than its factorization.

242502021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26944675 (or 26944672 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 242502021 is about 15572.4763926615. The cubic root of 242502021 is about 623.5985845911.

Adding to 242502021 its reverse (120205242), we get a palindrome (362707263).

The spelling of 242502021 in words is "two hundred forty-two million, five hundred two thousand, twenty-one".