25244721 has 12 divisors (see below), whose sum is σ = 36516480. Its totient is φ = 16805880.

The previous prime is 25244719. The next prime is 25244753. The reversal of 25244721 is 12744252.

It is not a de Polignac number, because 25244721 - 2¹ = 25244719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25244701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6660 + ... + 9738.

It is an arithmetic number, because the mean of its divisors is an integer number (3043040).

Almost surely, 2^25244721 is an apocalyptic number.

It is an amenable number.

25244721 is a deficient number, since it is larger than the sum of its proper divisors (11271759).

25244721 is a wasteful number, since it uses less digits than its factorization.

25244721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3996 (or 3993 counting only the distinct ones).

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

The square root of 25244721 is about 5024.4125029699. The cubic root of 25244721 is about 293.3527688855.

Adding to 25244721 its reverse (12744252), we get a palindrome (37988973).

The spelling of 25244721 in words is "twenty-five million, two hundred forty-four thousand, seven hundred twenty-one".