25106721 has 8 divisors (see below), whose sum is σ = 34630080. Its totient is φ = 16160592.

The previous prime is 25106701. The next prime is 25106723. The reversal of 25106721 is 12760152.

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

It is not a de Polignac number, because 25106721 - 2⁵ = 25106689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25106691 and 25106700.

It is not an unprimeable number, because it can be changed into a prime (25106723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144205 + ... + 144378.

It is an arithmetic number, because the mean of its divisors is an integer number (4328760).

Almost surely, 2^25106721 is an apocalyptic number.

It is an amenable number.

25106721 is a deficient number, since it is larger than the sum of its proper divisors (9523359).

25106721 is a wasteful number, since it uses less digits than its factorization.

25106721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288615.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 25106721 is about 5010.6607348732. The cubic root of 25106721 is about 292.8172553023.

Adding to 25106721 its reverse (12760152), we get a palindrome (37866873).

The spelling of 25106721 in words is "twenty-five million, one hundred six thousand, seven hundred twenty-one".