25425442125221 has 8 divisors (see below), whose sum is σ = 25436277431640. Its totient is φ = 25414607776768.

The previous prime is 25425442125103. The next prime is 25425442125227. The reversal of 25425442125221 is 12252124452452.

It can be written as a sum of positive squares in 4 ways, for example, as 1318432132900 + 24107009992321 = 1148230^2 + 4909889^2 .

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 25425442125221 - 2²⁶ = 25425375016357 is a prime.

It is a super-2 number, since 2×25425442125221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25425442125227) 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, 55614515 + ... + 56069823.

It is an arithmetic number, because the mean of its divisors is an integer number (3179534678955).

Almost surely, 2^{25425442125221} is an apocalyptic number.

It is an amenable number.

25425442125221 is a deficient number, since it is larger than the sum of its proper divisors (10835306419).

25425442125221 is a wasteful number, since it uses less digits than its factorization.

25425442125221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478983.

The product of its digits is 512000, while the sum is 41.

Adding to 25425442125221 its reverse (12252124452452), we get a palindrome (37677566577673).

The spelling of 25425442125221 in words is "twenty-five trillion, four hundred twenty-five billion, four hundred forty-two million, one hundred twenty-five thousand, two hundred twenty-one".