242800421 has 4 divisors (see below), whose sum is σ = 242831712. Its totient is φ = 242769132.

The previous prime is 242800387. The next prime is 242800427. The reversal of 242800421 is 124008242.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 242800421 - 2¹⁸ = 242538277 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 (242800427) 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, 5720 + ... + 22766.

It is an arithmetic number, because the mean of its divisors is an integer number (60707928).

Almost surely, 2^242800421 is an apocalyptic number.

It is an amenable number.

242800421 is a deficient number, since it is larger than the sum of its proper divisors (31291).

242800421 is a wasteful number, since it uses less digits than its factorization.

242800421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31290.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 242800421 is about 15582.0544537619. The cubic root of 242800421 is about 623.8542601852.

Adding to 242800421 its reverse (124008242), we get a palindrome (366808663).

The spelling of 242800421 in words is "two hundred forty-two million, eight hundred thousand, four hundred twenty-one".