25412721 has 4 divisors (see below), whose sum is σ = 33883632. Its totient is φ = 16941812.

The previous prime is 25412719. The next prime is 25412731. The reversal of 25412721 is 12721452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25412721 - 2¹ = 25412719 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25412691 and 25412700.

It is not an unprimeable number, because it can be changed into a prime (25412701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4235451 + ... + 4235456.

It is an arithmetic number, because the mean of its divisors is an integer number (8470908).

Almost surely, 2^25412721 is an apocalyptic number.

It is an amenable number.

25412721 is a deficient number, since it is larger than the sum of its proper divisors (8470911).

25412721 is an equidigital number, since it uses as much as digits as its factorization.

25412721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8470910.

The product of its digits is 1120, while the sum is 24.

The square root of 25412721 is about 5041.1031530807. The cubic root of 25412721 is about 294.0020708818.

The spelling of 25412721 in words is "twenty-five million, four hundred twelve thousand, seven hundred twenty-one".