240421421 has 4 divisors (see below), whose sum is σ = 253075200. Its totient is φ = 227767644.

The previous prime is 240421381. The next prime is 240421427. The reversal of 240421421 is 124124042.

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 240421421 - 2¹⁴ = 240405037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 240421393 and 240421402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240421427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6326861 + ... + 6326898.

It is an arithmetic number, because the mean of its divisors is an integer number (63268800).

Almost surely, 2^240421421 is an apocalyptic number.

It is an amenable number.

240421421 is a deficient number, since it is larger than the sum of its proper divisors (12653779).

240421421 is a wasteful number, since it uses less digits than its factorization.

240421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12653778.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 240421421 is about 15505.5287236521. The cubic root of 240421421 is about 621.8100254532.

Adding to 240421421 its reverse (124124042), we get a palindrome (364545463).

The spelling of 240421421 in words is "two hundred forty million, four hundred twenty-one thousand, four hundred twenty-one".