25421243 has 4 divisors (see below), whose sum is σ = 25482048. Its totient is φ = 25360440.

The previous prime is 25421237. The next prime is 25421251. The reversal of 25421243 is 34212452.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25421243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25423243) 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, 29771 + ... + 30612.

It is an arithmetic number, because the mean of its divisors is an integer number (6370512).

Almost surely, 2^25421243 is an apocalyptic number.

25421243 is a deficient number, since it is larger than the sum of its proper divisors (60805).

25421243 is an equidigital number, since it uses as much as digits as its factorization.

25421243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60804.

The product of its digits is 1920, while the sum is 23.

The square root of 25421243 is about 5041.9483337297. The cubic root of 25421243 is about 294.0349311389.

Adding to 25421243 its reverse (34212452), we get a palindrome (59633695).

It can be divided in two parts, 2 and 5421243, that added together give a palindrome (5421245).

The spelling of 25421243 in words is "twenty-five million, four hundred twenty-one thousand, two hundred forty-three".