25050721 has 4 divisors (see below), whose sum is σ = 26369200. Its totient is φ = 23732244.

The previous prime is 25050691. The next prime is 25050731. The reversal of 25050721 is 12705052.

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 25050721 - 2⁵ = 25050689 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25050692 and 25050701.

It is not an unprimeable number, because it can be changed into a prime (25050731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659211 + ... + 659248.

It is an arithmetic number, because the mean of its divisors is an integer number (6592300).

Almost surely, 2^25050721 is an apocalyptic number.

It is an amenable number.

25050721 is a deficient number, since it is larger than the sum of its proper divisors (1318479).

25050721 is a wasteful number, since it uses less digits than its factorization.

25050721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318478.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 25050721 is about 5005.0695299866. The cubic root of 25050721 is about 292.5993857121.

Adding to 25050721 its reverse (12705052), we get a palindrome (37755773).

The spelling of 25050721 in words is "twenty-five million, fifty thousand, seven hundred twenty-one".