25143421 has 4 divisors (see below), whose sum is σ = 25185052. Its totient is φ = 25101792.

The previous prime is 25143413. The next prime is 25143427. The reversal of 25143421 is 12434152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7080921 + 18062500 = 2661^2 + 4250^2 .

It is a cyclic number.

It is not a de Polignac number, because 25143421 - 2³ = 25143413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25143392 and 25143401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25143427) 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, 19896 + ... + 21121.

It is an arithmetic number, because the mean of its divisors is an integer number (6296263).

Almost surely, 2^25143421 is an apocalyptic number.

It is an amenable number.

25143421 is a deficient number, since it is larger than the sum of its proper divisors (41631).

25143421 is an equidigital number, since it uses as much as digits as its factorization.

25143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41630.

The product of its digits is 960, while the sum is 22.

The square root of 25143421 is about 5014.3215892083. The cubic root of 25143421 is about 292.9598620211.

Adding to 25143421 its reverse (12434152), we get a palindrome (37577573).

The spelling of 25143421 in words is "twenty-five million, one hundred forty-three thousand, four hundred twenty-one".