240204421 has 4 divisors (see below), whose sum is σ = 240235744. Its totient is φ = 240173100.

The previous prime is 240204401. The next prime is 240204443. The reversal of 240204421 is 124402042.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124402042 = 2 ⋅62201021.

It is a cyclic number.

It is not a de Polignac number, because 240204421 - 2¹⁵ = 240171653 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 (240204401) 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, 4456 + ... + 22366.

It is an arithmetic number, because the mean of its divisors is an integer number (60058936).

Almost surely, 2^240204421 is an apocalyptic number.

It is an amenable number.

240204421 is a deficient number, since it is larger than the sum of its proper divisors (31323).

240204421 is a wasteful number, since it uses less digits than its factorization.

240204421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31322.

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

The square root of 240204421 is about 15498.5296399368. The cubic root of 240204421 is about 621.6228910022.

Adding to 240204421 its reverse (124402042), we get a palindrome (364606463).

It can be divided in two parts, 24020 and 4421, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 240204421 in words is "two hundred forty million, two hundred four thousand, four hundred twenty-one".