242502821 has 4 divisors (see below), whose sum is σ = 264548544. Its totient is φ = 220457100.

The previous prime is 242502809. The next prime is 242502857. The reversal of 242502821 is 128205242.

242502821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 242502821 - 2¹⁴ = 242486437 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 (242502121) 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, 11022845 + ... + 11022866.

It is an arithmetic number, because the mean of its divisors is an integer number (66137136).

Almost surely, 2^242502821 is an apocalyptic number.

It is an amenable number.

242502821 is a deficient number, since it is larger than the sum of its proper divisors (22045723).

242502821 is a wasteful number, since it uses less digits than its factorization.

242502821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22045722.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 242502821 is about 15572.5020789853. The cubic root of 242502821 is about 623.5992703288.

The spelling of 242502821 in words is "two hundred forty-two million, five hundred two thousand, eight hundred twenty-one".