25420384421 has 4 divisors (see below), whose sum is σ = 25961243712. Its totient is φ = 24879525132.

The previous prime is 25420384403. The next prime is 25420384439. The reversal of 25420384421 is 12448302452.

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 an interprime number because it is at equal distance from previous prime (25420384403) and next prime (25420384439).

It is a cyclic number.

It is not a de Polignac number, because 25420384421 - 2¹⁴ = 25420368037 is a prime.

It is a super-2 number, since 2×25420384421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25420384321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270429575 + ... + 270429668.

It is an arithmetic number, because the mean of its divisors is an integer number (6490310928).

Almost surely, 2^25420384421 is an apocalyptic number.

It is an amenable number.

25420384421 is a deficient number, since it is larger than the sum of its proper divisors (540859291).

25420384421 is an equidigital number, since it uses as much as digits as its factorization.

25420384421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540859290.

The product of its (nonzero) digits is 61440, while the sum is 35.

Adding to 25420384421 its reverse (12448302452), we get a palindrome (37868686873).

The spelling of 25420384421 in words is "twenty-five billion, four hundred twenty million, three hundred eighty-four thousand, four hundred twenty-one".