242243621 has 8 divisors (see below), whose sum is σ = 249739224. Its totient is φ = 234823680.

The previous prime is 242243587. The next prime is 242243623. The reversal of 242243621 is 126342242.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3880900 + 238362721 = 1970^2 + 15439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242243621 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 (242243623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12380 + ... + 25253.

It is an arithmetic number, because the mean of its divisors is an integer number (31217403).

Almost surely, 2^242243621 is an apocalyptic number.

It is an amenable number.

242243621 is a deficient number, since it is larger than the sum of its proper divisors (7495603).

242243621 is a wasteful number, since it uses less digits than its factorization.

242243621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37831.

The product of its digits is 4608, while the sum is 26.

The square root of 242243621 is about 15564.1774919203. The cubic root of 242243621 is about 623.3770123592.

Adding to 242243621 its reverse (126342242), we get a palindrome (368585863).

The spelling of 242243621 in words is "two hundred forty-two million, two hundred forty-three thousand, six hundred twenty-one".