240240421 has 4 divisors (see below), whose sum is σ = 247990144. Its totient is φ = 232490700.

The previous prime is 240240419. The next prime is 240240431. The reversal of 240240421 is 124042042.

240240421 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, and also an emirpimes, since its reverse is a distinct semiprime: 124042042 = 2 ⋅62021021.

It is not a de Polignac number, because 240240421 - 2¹ = 240240419 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 (240240401) 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, 3874815 + ... + 3874876.

It is an arithmetic number, because the mean of its divisors is an integer number (61997536).

Almost surely, 2^240240421 is an apocalyptic number.

It is an amenable number.

240240421 is a deficient number, since it is larger than the sum of its proper divisors (7749723).

240240421 is an equidigital number, since it uses as much as digits as its factorization.

240240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7749722.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 240240421 is about 15499.6909969199. The cubic root of 240240421 is about 621.6539441445.

Adding to 240240421 its reverse (124042042), we get a palindrome (364282463).

The spelling of 240240421 in words is "two hundred forty million, two hundred forty thousand, four hundred twenty-one".