25235725206121 has 2 divisors, whose sum is σ = 25235725206122. Its totient is φ = 25235725206120.

The previous prime is 25235725206023. The next prime is 25235725206143. The reversal of 25235725206121 is 12160252753252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15244815700521 + 9990909505600 = 3904461^2 + 3160840^2 .

It is a cyclic number.

It is not a de Polignac number, because 25235725206121 - 2²⁵ = 25235691651689 is a prime.

It is not a weakly prime, because it can be changed into another prime (25235725206221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12617862603060 + 12617862603061.

It is an arithmetic number, because the mean of its divisors is an integer number (12617862603061).

Almost surely, 2^{25235725206121} is an apocalyptic number.

It is an amenable number.

25235725206121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25235725206121 is an equidigital number, since it uses as much as digits as its factorization.

25235725206121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 43.

Adding to 25235725206121 its reverse (12160252753252), we get a palindrome (37395977959373).

The spelling of 25235725206121 in words is "twenty-five trillion, two hundred thirty-five billion, seven hundred twenty-five million, two hundred six thousand, one hundred twenty-one".