265243421 has 4 divisors (see below), whose sum is σ = 265302144. Its totient is φ = 265184700.

The previous prime is 265243411. The next prime is 265243423. The reversal of 265243421 is 124342562.

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: 124342562 = 2 ⋅62171281.

It is a cyclic number.

It is not a de Polignac number, because 265243421 - 2¹⁴ = 265227037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265243423) 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, 21965 + ... + 31826.

It is an arithmetic number, because the mean of its divisors is an integer number (66325536).

Almost surely, 2^265243421 is an apocalyptic number.

It is an amenable number.

265243421 is a deficient number, since it is larger than the sum of its proper divisors (58723).

265243421 is an equidigital number, since it uses as much as digits as its factorization.

265243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58722.

The product of its digits is 11520, while the sum is 29.

The square root of 265243421 is about 16286.2954965210. The cubic root of 265243421 is about 642.5124393116.

Adding to 265243421 its reverse (124342562), we get a palindrome (389585983).

The spelling of 265243421 in words is "two hundred sixty-five million, two hundred forty-three thousand, four hundred twenty-one".