25255221121 has 8 divisors (see below), whose sum is σ = 27201101480. Its totient is φ = 23309793792.

The previous prime is 25255221119. The next prime is 25255221149. The reversal of 25255221121 is 12112255252.

It can be written as a sum of positive squares in 4 ways, for example, as 681210000 + 24574011121 = 26100^2 + 156761^2 .

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 25255221121 - 2¹ = 25255221119 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 25255221121.

It is not an unprimeable number, because it can be changed into a prime (25255221181) 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, 7291 + ... + 224863.

It is an arithmetic number, because the mean of its divisors is an integer number (3400137685).

Almost surely, 2^25255221121 is an apocalyptic number.

It is an amenable number.

25255221121 is a deficient number, since it is larger than the sum of its proper divisors (1945880359).

25255221121 is a wasteful number, since it uses less digits than its factorization.

25255221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226515.

The product of its digits is 4000, while the sum is 28.

Adding to 25255221121 its reverse (12112255252), we get a palindrome (37367476373).

The spelling of 25255221121 in words is "twenty-five billion, two hundred fifty-five million, two hundred twenty-one thousand, one hundred twenty-one".