25227721 has 4 divisors (see below), whose sum is σ = 25394944. Its totient is φ = 25060500.

The previous prime is 25227701. The next prime is 25227731. The reversal of 25227721 is 12772252.

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 25227721 - 2⁵ = 25227689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25227721.

It is not an unprimeable number, because it can be changed into a prime (25227701) 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, 83385 + ... + 83686.

It is an arithmetic number, because the mean of its divisors is an integer number (6348736).

Almost surely, 2^25227721 is an apocalyptic number.

It is an amenable number.

25227721 is a deficient number, since it is larger than the sum of its proper divisors (167223).

25227721 is a wasteful number, since it uses less digits than its factorization.

25227721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167222.

The product of its digits is 3920, while the sum is 28.

The square root of 25227721 is about 5022.7204779880. The cubic root of 25227721 is about 293.2869053872.

Adding to 25227721 its reverse (12772252), we get a palindrome (37999973).

The spelling of 25227721 in words is "twenty-five million, two hundred twenty-seven thousand, seven hundred twenty-one".