25126721 has 8 divisors (see below), whose sum is σ = 26548320. Its totient is φ = 23715072.

The previous prime is 25126681. The next prime is 25126723. The reversal of 25126721 is 12762152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25126721 - 2⁶ = 25126657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25126723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3041 + ... + 7713.

It is an arithmetic number, because the mean of its divisors is an integer number (3318540).

Almost surely, 2^25126721 is an apocalyptic number.

It is an amenable number.

25126721 is a deficient number, since it is larger than the sum of its proper divisors (1421599).

25126721 is a wasteful number, since it uses less digits than its factorization.

25126721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975.

The product of its digits is 1680, while the sum is 26.

The square root of 25126721 is about 5012.6560823579. The cubic root of 25126721 is about 292.8949873532.

Adding to 25126721 its reverse (12762152), we get a palindrome (37888873).

The spelling of 25126721 in words is "twenty-five million, one hundred twenty-six thousand, seven hundred twenty-one".