25421247 has 6 divisors (see below), whose sum is σ = 36719592. Its totient is φ = 16947492.

The previous prime is 25421237. The next prime is 25421251. The reversal of 25421247 is 74212452.

It is not a de Polignac number, because 25421247 - 2⁷ = 25421119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25421247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1412283 + ... + 1412300.

It is an arithmetic number, because the mean of its divisors is an integer number (6119932).

Almost surely, 2^25421247 is an apocalyptic number.

25421247 is a deficient number, since it is larger than the sum of its proper divisors (11298345).

25421247 is a wasteful number, since it uses less digits than its factorization.

25421247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824589 (or 2824586 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 25421247 is about 5041.9487304018. The cubic root of 25421247 is about 294.0349465609.

Adding to 25421247 its reverse (74212452), we get a palindrome (99633699).

The spelling of 25421247 in words is "twenty-five million, four hundred twenty-one thousand, two hundred forty-seven".