242642621 has 8 divisors (see below), whose sum is σ = 261636480. Its totient is φ = 223695792.

The previous prime is 242642579. The next prime is 242642629. The reversal of 242642621 is 126246242.

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

It is a cyclic number.

It is not a de Polignac number, because 242642621 - 2⁶ = 242642557 is a prime.

It is a super-3 number, since 3×242642621³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242642629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641 + ... + 22038.

It is an arithmetic number, because the mean of its divisors is an integer number (32704560).

Almost surely, 2^242642621 is an apocalyptic number.

It is an amenable number.

242642621 is a deficient number, since it is larger than the sum of its proper divisors (18993859).

242642621 is a wasteful number, since it uses less digits than its factorization.

242642621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23515.

The product of its digits is 9216, while the sum is 29.

The square root of 242642621 is about 15576.9901136259. The cubic root of 242642621 is about 623.7190798364.

Adding to 242642621 its reverse (126246242), we get a palindrome (368888863).

The spelling of 242642621 in words is "two hundred forty-two million, six hundred forty-two thousand, six hundred twenty-one".